Se da la desigualdad:
$$\frac{\left(- 4^{x + 1} + \left(2 \cdot 3^{2 x + 1} - 6^{x}\right)\right) - 9}{9^{x} - 3} \leq 3$$
Para resolver esta desigualdad primero hay que resolver la ecuación correspondiente:
$$\frac{\left(- 4^{x + 1} + \left(2 \cdot 3^{2 x + 1} - 6^{x}\right)\right) - 9}{9^{x} - 3} = 3$$
Resolvemos:
$$x_{1} = -143.417884716279$$
$$x_{2} = -23.0088292911765$$
$$x_{3} = -46$$
$$x_{4} = -37.0161201630754$$
$$x_{5} = -3258489709168.54$$
$$x_{6} = -84$$
$$x_{7} = -25.0125858814494$$
$$x_{8} = -68$$
$$x_{9} = -90$$
$$x_{10} = -31.0158155027083$$
$$x_{11} = -98$$
$$x_{12} = -16993235.7210244$$
$$x_{13} = -4.81569548255271 \cdot 10^{15}$$
$$x_{14} = -44.5710701956579$$
$$x_{15} = -6.24818853962164 \cdot 10^{17}$$
$$x_{16} = -21.0031482604291$$
$$x_{17} = -11161915298.3515$$
$$x_{18} = -643652288132.243$$
$$x_{19} = -4960851182.46991$$
$$x_{20} = -29.0154049598892$$
$$x_{21} = -48$$
$$x_{22} = -7331601845787.07$$
$$x_{23} = -25789.6138194469$$
$$x_{24} = -58$$
$$x_{25} = -5.48537813533922 \cdot 10^{16}$$
$$x_{26} = -60$$
$$x_{27} = -38234900.6661399$$
$$x_{28} = -35.0160832913845$$
$$x_{29} = -92$$
$$x_{30} = -86$$
$$x_{31} = -1.23421007870129 \cdot 10^{17}$$
$$x_{32} = -37116234344798.6$$
$$x_{33} = -43.0704282853555$$
$$x_{34} = -100$$
$$x_{35} = -24.1893328005796$$
$$x_{36} = -27.0145033199437$$
$$x_{37} = -11418.8350591212$$
$$x_{38} = -187900936370906$$
$$x_{39} = -76$$
$$x_{40} = -127141192622.106$$
$$x_{41} = -1491778.32834008$$
$$x_{42} = -83511527276021.7$$
$$x_{43} = -294602.579016381$$
$$x_{44} = -78$$
$$x_{45} = -193564586.203078$$
$$x_{46} = -44.5815072958613$$
$$x_{47} = -2.43794583844066 \cdot 10^{16}$$
$$x_{48} = -56$$
$$x_{49} = -7552496.85674014$$
$$x_{50} = -16496104153180.4$$
$$x_{51} = -66$$
$$x_{52} = -82$$
$$x_{53} = -422777106834121$$
$$x_{54} = -88$$
$$x_{55} = -435520446.751108$$
$$x_{56} = -951248490381203$$
$$x_{57} = -41.019925261663$$
$$x_{58} = -86028649.2928612$$
$$x_{59} = -383.866735900145$$
$$x_{60} = -72$$
$$x_{61} = -39.0164395826827$$
$$x_{62} = -979921135.484193$$
$$x_{63} = -662963.57505738$$
$$x_{64} = -5033.24005178009$$
$$x_{65} = -74$$
$$x_{66} = -3.16314535877848 \cdot 10^{18}$$
$$x_{67} = -1.40584243276788 \cdot 10^{18}$$
$$x_{68} = -44.5818196229614$$
$$x_{69} = -1.08353148367553 \cdot 10^{16}$$
$$x_{70} = -44.573231296778$$
$$x_{71} = -286067683547.532$$
$$x_{72} = -2204822687.63364$$
$$x_{73} = -25114309561.5851$$
$$x_{74} = -2.77697267929279 \cdot 10^{17}$$
$$x_{75} = -62$$
$$x_{76} = -44.7272916666667$$
$$x_{77} = -45.0400882213706$$
$$x_{78} = -130887.704072476$$
$$x_{79} = -3356614.02864514$$
$$x_{80} = -54$$
$$x_{81} = -1448217648450.36$$
$$x_{82} = -64$$
$$x_{83} = -56507196656.3607$$
$$x_{84} = -58126.6759336368$$
$$x_{85} = -70$$
$$x_{86} = -96$$
$$x_{87} = -52$$
$$x_{88} = -80$$
$$x_{89} = -2.14030910340605 \cdot 10^{15}$$
$$x_{90} = -938.975140164849$$
$$x_{91} = -2196.98293223217$$
$$x_{92} = -44.5784608333706$$
$$x_{93} = -33.0159999023233$$
$$x_{94} = -94$$
$$x_{95} = -44.5732309457478$$
$$x_{96} = -50$$
$$x_{1} = -143.417884716279$$
$$x_{2} = -23.0088292911765$$
$$x_{3} = -46$$
$$x_{4} = -37.0161201630754$$
$$x_{5} = -3258489709168.54$$
$$x_{6} = -84$$
$$x_{7} = -25.0125858814494$$
$$x_{8} = -68$$
$$x_{9} = -90$$
$$x_{10} = -31.0158155027083$$
$$x_{11} = -98$$
$$x_{12} = -16993235.7210244$$
$$x_{13} = -4.81569548255271 \cdot 10^{15}$$
$$x_{14} = -44.5710701956579$$
$$x_{15} = -6.24818853962164 \cdot 10^{17}$$
$$x_{16} = -21.0031482604291$$
$$x_{17} = -11161915298.3515$$
$$x_{18} = -643652288132.243$$
$$x_{19} = -4960851182.46991$$
$$x_{20} = -29.0154049598892$$
$$x_{21} = -48$$
$$x_{22} = -7331601845787.07$$
$$x_{23} = -25789.6138194469$$
$$x_{24} = -58$$
$$x_{25} = -5.48537813533922 \cdot 10^{16}$$
$$x_{26} = -60$$
$$x_{27} = -38234900.6661399$$
$$x_{28} = -35.0160832913845$$
$$x_{29} = -92$$
$$x_{30} = -86$$
$$x_{31} = -1.23421007870129 \cdot 10^{17}$$
$$x_{32} = -37116234344798.6$$
$$x_{33} = -43.0704282853555$$
$$x_{34} = -100$$
$$x_{35} = -24.1893328005796$$
$$x_{36} = -27.0145033199437$$
$$x_{37} = -11418.8350591212$$
$$x_{38} = -187900936370906$$
$$x_{39} = -76$$
$$x_{40} = -127141192622.106$$
$$x_{41} = -1491778.32834008$$
$$x_{42} = -83511527276021.7$$
$$x_{43} = -294602.579016381$$
$$x_{44} = -78$$
$$x_{45} = -193564586.203078$$
$$x_{46} = -44.5815072958613$$
$$x_{47} = -2.43794583844066 \cdot 10^{16}$$
$$x_{48} = -56$$
$$x_{49} = -7552496.85674014$$
$$x_{50} = -16496104153180.4$$
$$x_{51} = -66$$
$$x_{52} = -82$$
$$x_{53} = -422777106834121$$
$$x_{54} = -88$$
$$x_{55} = -435520446.751108$$
$$x_{56} = -951248490381203$$
$$x_{57} = -41.019925261663$$
$$x_{58} = -86028649.2928612$$
$$x_{59} = -383.866735900145$$
$$x_{60} = -72$$
$$x_{61} = -39.0164395826827$$
$$x_{62} = -979921135.484193$$
$$x_{63} = -662963.57505738$$
$$x_{64} = -5033.24005178009$$
$$x_{65} = -74$$
$$x_{66} = -3.16314535877848 \cdot 10^{18}$$
$$x_{67} = -1.40584243276788 \cdot 10^{18}$$
$$x_{68} = -44.5818196229614$$
$$x_{69} = -1.08353148367553 \cdot 10^{16}$$
$$x_{70} = -44.573231296778$$
$$x_{71} = -286067683547.532$$
$$x_{72} = -2204822687.63364$$
$$x_{73} = -25114309561.5851$$
$$x_{74} = -2.77697267929279 \cdot 10^{17}$$
$$x_{75} = -62$$
$$x_{76} = -44.7272916666667$$
$$x_{77} = -45.0400882213706$$
$$x_{78} = -130887.704072476$$
$$x_{79} = -3356614.02864514$$
$$x_{80} = -54$$
$$x_{81} = -1448217648450.36$$
$$x_{82} = -64$$
$$x_{83} = -56507196656.3607$$
$$x_{84} = -58126.6759336368$$
$$x_{85} = -70$$
$$x_{86} = -96$$
$$x_{87} = -52$$
$$x_{88} = -80$$
$$x_{89} = -2.14030910340605 \cdot 10^{15}$$
$$x_{90} = -938.975140164849$$
$$x_{91} = -2196.98293223217$$
$$x_{92} = -44.5784608333706$$
$$x_{93} = -33.0159999023233$$
$$x_{94} = -94$$
$$x_{95} = -44.5732309457478$$
$$x_{96} = -50$$
Las raíces dadas
$$x_{66} = -3.16314535877848 \cdot 10^{18}$$
$$x_{67} = -1.40584243276788 \cdot 10^{18}$$
$$x_{15} = -6.24818853962164 \cdot 10^{17}$$
$$x_{74} = -2.77697267929279 \cdot 10^{17}$$
$$x_{31} = -1.23421007870129 \cdot 10^{17}$$
$$x_{25} = -5.48537813533922 \cdot 10^{16}$$
$$x_{47} = -2.43794583844066 \cdot 10^{16}$$
$$x_{69} = -1.08353148367553 \cdot 10^{16}$$
$$x_{13} = -4.81569548255271 \cdot 10^{15}$$
$$x_{89} = -2.14030910340605 \cdot 10^{15}$$
$$x_{56} = -951248490381203$$
$$x_{53} = -422777106834121$$
$$x_{38} = -187900936370906$$
$$x_{42} = -83511527276021.7$$
$$x_{32} = -37116234344798.6$$
$$x_{50} = -16496104153180.4$$
$$x_{22} = -7331601845787.07$$
$$x_{5} = -3258489709168.54$$
$$x_{81} = -1448217648450.36$$
$$x_{18} = -643652288132.243$$
$$x_{71} = -286067683547.532$$
$$x_{40} = -127141192622.106$$
$$x_{83} = -56507196656.3607$$
$$x_{73} = -25114309561.5851$$
$$x_{17} = -11161915298.3515$$
$$x_{19} = -4960851182.46991$$
$$x_{72} = -2204822687.63364$$
$$x_{62} = -979921135.484193$$
$$x_{55} = -435520446.751108$$
$$x_{45} = -193564586.203078$$
$$x_{58} = -86028649.2928612$$
$$x_{27} = -38234900.6661399$$
$$x_{12} = -16993235.7210244$$
$$x_{49} = -7552496.85674014$$
$$x_{79} = -3356614.02864514$$
$$x_{41} = -1491778.32834008$$
$$x_{63} = -662963.57505738$$
$$x_{43} = -294602.579016381$$
$$x_{78} = -130887.704072476$$
$$x_{84} = -58126.6759336368$$
$$x_{23} = -25789.6138194469$$
$$x_{37} = -11418.8350591212$$
$$x_{64} = -5033.24005178009$$
$$x_{91} = -2196.98293223217$$
$$x_{90} = -938.975140164849$$
$$x_{59} = -383.866735900145$$
$$x_{1} = -143.417884716279$$
$$x_{34} = -100$$
$$x_{11} = -98$$
$$x_{86} = -96$$
$$x_{94} = -94$$
$$x_{29} = -92$$
$$x_{9} = -90$$
$$x_{54} = -88$$
$$x_{30} = -86$$
$$x_{6} = -84$$
$$x_{52} = -82$$
$$x_{88} = -80$$
$$x_{44} = -78$$
$$x_{39} = -76$$
$$x_{65} = -74$$
$$x_{60} = -72$$
$$x_{85} = -70$$
$$x_{8} = -68$$
$$x_{51} = -66$$
$$x_{82} = -64$$
$$x_{75} = -62$$
$$x_{26} = -60$$
$$x_{24} = -58$$
$$x_{48} = -56$$
$$x_{80} = -54$$
$$x_{87} = -52$$
$$x_{96} = -50$$
$$x_{21} = -48$$
$$x_{3} = -46$$
$$x_{77} = -45.0400882213706$$
$$x_{76} = -44.7272916666667$$
$$x_{68} = -44.5818196229614$$
$$x_{46} = -44.5815072958613$$
$$x_{92} = -44.5784608333706$$
$$x_{70} = -44.573231296778$$
$$x_{95} = -44.5732309457478$$
$$x_{14} = -44.5710701956579$$
$$x_{33} = -43.0704282853555$$
$$x_{57} = -41.019925261663$$
$$x_{61} = -39.0164395826827$$
$$x_{4} = -37.0161201630754$$
$$x_{28} = -35.0160832913845$$
$$x_{93} = -33.0159999023233$$
$$x_{10} = -31.0158155027083$$
$$x_{20} = -29.0154049598892$$
$$x_{36} = -27.0145033199437$$
$$x_{7} = -25.0125858814494$$
$$x_{35} = -24.1893328005796$$
$$x_{2} = -23.0088292911765$$
$$x_{16} = -21.0031482604291$$
son puntos de cambio del signo de desigualdad en las soluciones.
Primero definámonos con el signo hasta el punto extremo izquierdo:
$$x_{0} \leq x_{66}$$
Consideremos, por ejemplo, el punto
$$x_{0} = x_{66} - \frac{1}{10}$$
=
$$-3.16314535877848 \cdot 10^{18} + - \frac{1}{10}$$
=
$$-3.16314535877848 \cdot 10^{18}$$
lo sustituimos en la expresión
$$\frac{\left(- 4^{x + 1} + \left(2 \cdot 3^{2 x + 1} - 6^{x}\right)\right) - 9}{9^{x} - 3} \leq 3$$
$$\frac{-9 + \left(\left(2 \cdot 3^{\left(-3.16314535877848 \cdot 10^{18}\right) 2 + 1} - 6^{-3.16314535877848 \cdot 10^{18}}\right) - 4^{-3.16314535877848 \cdot 10^{18} + 1}\right)}{-3 + 9^{-3.16314535877848 \cdot 10^{18}}} \leq 3$$
3 <= 3
pero
3 >= 3
significa que una de las soluciones de nuestra ecuación será con:
$$x \leq -3.16314535877848 \cdot 10^{18}$$
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x66 x67 x15 x74 x31 x25 x47 x69 x13 x89 x56 x53 x38 x42 x32 x50 x22 x5 x81 x18 x71 x40 x83 x73 x17 x19 x72 x62 x55 x45 x58 x27 x12 x49 x79 x41 x63 x43 x78 x84 x23 x37 x64 x91 x90 x59 x1 x34 x11 x86 x94 x29 x9 x54 x30 x6 x52 x88 x44 x39 x65 x60 x85 x8 x51 x82 x75 x26 x24 x48 x80 x87 x96 x21 x3 x77 x76 x68 x46 x92 x70 x95 x14 x33 x57 x61 x4 x28 x93 x10 x20 x36 x7 x35 x2 x16
Recibiremos otras soluciones de la desigualdad pasando al polo siguiente etc.
etc.
Respuesta:
$$x \leq -3.16314535877848 \cdot 10^{18}$$
$$x \geq -1.40584243276788 \cdot 10^{18} \wedge x \leq -6.24818853962164 \cdot 10^{17}$$
$$x \geq -2.77697267929279 \cdot 10^{17} \wedge x \leq -1.23421007870129 \cdot 10^{17}$$
$$x \geq -5.48537813533922 \cdot 10^{16} \wedge x \leq -2.43794583844066 \cdot 10^{16}$$
$$x \geq -1.08353148367553 \cdot 10^{16} \wedge x \leq -4.81569548255271 \cdot 10^{15}$$
$$x \geq -2.14030910340605 \cdot 10^{15} \wedge x \leq -951248490381203$$
$$x \geq -422777106834121 \wedge x \leq -187900936370906$$
$$x \geq -83511527276021.7 \wedge x \leq -37116234344798.6$$
$$x \geq -16496104153180.4 \wedge x \leq -7331601845787.07$$
$$x \geq -3258489709168.54 \wedge x \leq -1448217648450.36$$
$$x \geq -643652288132.243 \wedge x \leq -286067683547.532$$
$$x \geq -127141192622.106 \wedge x \leq -56507196656.3607$$
$$x \geq -25114309561.5851 \wedge x \leq -11161915298.3515$$
$$x \geq -4960851182.46991 \wedge x \leq -2204822687.63364$$
$$x \geq -979921135.484193 \wedge x \leq -435520446.751108$$
$$x \geq -193564586.203078 \wedge x \leq -86028649.2928612$$
$$x \geq -38234900.6661399 \wedge x \leq -16993235.7210244$$
$$x \geq -7552496.85674014 \wedge x \leq -3356614.02864514$$
$$x \geq -1491778.32834008 \wedge x \leq -662963.57505738$$
$$x \geq -294602.579016381 \wedge x \leq -130887.704072476$$
$$x \geq -58126.6759336368 \wedge x \leq -25789.6138194469$$
$$x \geq -11418.8350591212 \wedge x \leq -5033.24005178009$$
$$x \geq -2196.98293223217 \wedge x \leq -938.975140164849$$
$$x \geq -383.866735900145 \wedge x \leq -143.417884716279$$
$$x \geq -100 \wedge x \leq -98$$
$$x \geq -96 \wedge x \leq -94$$
$$x \geq -92 \wedge x \leq -90$$
$$x \geq -88 \wedge x \leq -86$$
$$x \geq -84 \wedge x \leq -82$$
$$x \geq -80 \wedge x \leq -78$$
$$x \geq -76 \wedge x \leq -74$$
$$x \geq -72 \wedge x \leq -70$$
$$x \geq -68 \wedge x \leq -66$$
$$x \geq -64 \wedge x \leq -62$$
$$x \geq -60 \wedge x \leq -58$$
$$x \geq -56 \wedge x \leq -54$$
$$x \geq -52 \wedge x \leq -50$$
$$x \geq -48 \wedge x \leq -46$$
$$x \geq -45.0400882213706 \wedge x \leq -44.7272916666667$$
$$x \geq -44.5818196229614 \wedge x \leq -44.5815072958613$$
$$x \geq -44.5784608333706 \wedge x \leq -44.573231296778$$
$$x \geq -44.5732309457478 \wedge x \leq -44.5710701956579$$
$$x \geq -43.0704282853555 \wedge x \leq -41.019925261663$$
$$x \geq -39.0164395826827 \wedge x \leq -37.0161201630754$$
$$x \geq -35.0160832913845 \wedge x \leq -33.0159999023233$$
$$x \geq -31.0158155027083 \wedge x \leq -29.0154049598892$$
$$x \geq -27.0145033199437 \wedge x \leq -25.0125858814494$$
$$x \geq -24.1893328005796 \wedge x \leq -23.0088292911765$$
$$x \geq -21.0031482604291$$