18000*(1+(3/20))^x-1/(3/20)*(1+(3/20))^x=76000 la ecuación
El profesor se sorprenderá mucho al ver tu solución correcta😉
Solución
Solución detallada
Tenemos la ecuación:
$$- \frac{\left(\frac{3}{20} + 1\right)^{x}}{\frac{3}{20}} + 18000 \left(\frac{3}{20} + 1\right)^{x} = 76000$$
o
$$\left(- \frac{\left(\frac{3}{20} + 1\right)^{x}}{\frac{3}{20}} + 18000 \left(\frac{3}{20} + 1\right)^{x}\right) - 76000 = 0$$
o
$$\frac{53980 \left(\frac{23}{20}\right)^{x}}{3} = 76000$$
o
$$\left(\frac{23}{20}\right)^{x} = \frac{11400}{2699}$$
- es la ecuación exponencial más simple
Sustituimos
$$v = \left(\frac{23}{20}\right)^{x}$$
obtendremos
$$v - \frac{11400}{2699} = 0$$
o
$$v - \frac{11400}{2699} = 0$$
Transportamos los términos libres (sin v)
del miembro izquierdo al derecho, obtenemos:
$$v = \frac{11400}{2699}$$
Obtenemos la respuesta: v = 11400/2699
hacemos cambio inverso
$$\left(\frac{23}{20}\right)^{x} = v$$
o
$$x = \frac{\log{\left(v \right)}}{\log{\left(\frac{23}{20} \right)}}$$
Entonces la respuesta definitiva es
$$x_{1} = \frac{\log{\left(\frac{11400}{2699} \right)}}{\log{\left(\frac{23}{20} \right)}} = \log{\left(\left(\frac{11400}{2699}\right)^{\frac{1}{\log{\left(\frac{23}{20} \right)}}} \right)}$$
/ 1 \
| -------|
| /20\|
| log|--||
| \23/|
|/11400\ |
x1 = -log||-----| |
\\ 2699/ /
$$x_{1} = - \log{\left(\left(\frac{11400}{2699}\right)^{\frac{1}{\log{\left(\frac{20}{23} \right)}}} \right)}$$
/ 1 \
| -------|
| /20\|
| log|--||
| \23/|
|/ 2699\ |
x2 = log||-----| |
\\11400/ /
$$x_{2} = \log{\left(\left(\frac{2699}{11400}\right)^{\frac{1}{\log{\left(\frac{20}{23} \right)}}} \right)}$$
x2 = log((2699/11400)^(1/log(20/23)))
Suma y producto de raíces
[src]
/ 1 \ / 1 \
| -------| | -------|
| /20\| | /20\|
| log|--|| | log|--||
| \23/| | \23/|
|/11400\ | |/ 2699\ |
- log||-----| | + log||-----| |
\\ 2699/ / \\11400/ /
$$- \log{\left(\left(\frac{11400}{2699}\right)^{\frac{1}{\log{\left(\frac{20}{23} \right)}}} \right)} + \log{\left(\left(\frac{2699}{11400}\right)^{\frac{1}{\log{\left(\frac{20}{23} \right)}}} \right)}$$
/ 1 \ / 1 \
| -------| | -------|
| /20\| | /20\|
| log|--|| | log|--||
| \23/| | \23/|
|/11400\ | |/ 2699\ |
- log||-----| | + log||-----| |
\\ 2699/ / \\11400/ /
$$- \log{\left(\left(\frac{11400}{2699}\right)^{\frac{1}{\log{\left(\frac{20}{23} \right)}}} \right)} + \log{\left(\left(\frac{2699}{11400}\right)^{\frac{1}{\log{\left(\frac{20}{23} \right)}}} \right)}$$
/ 1 \ / 1 \
| -------| | -------|
| /20\| | /20\|
| log|--|| | log|--||
| \23/| | \23/|
|/11400\ | |/ 2699\ |
-log||-----| |*log||-----| |
\\ 2699/ / \\11400/ /
$$- \log{\left(\left(\frac{11400}{2699}\right)^{\frac{1}{\log{\left(\frac{20}{23} \right)}}} \right)} \log{\left(\left(\frac{2699}{11400}\right)^{\frac{1}{\log{\left(\frac{20}{23} \right)}}} \right)}$$
2 2 / log(7284601)\
log (2699) + log (11400) - log\11400 /
-------------------------------------------------
2 2 / log(400)\
log (20) + log (23) - log\23 /
$$\frac{- \log{\left(11400^{\log{\left(7284601 \right)}} \right)} + \log{\left(2699 \right)}^{2} + \log{\left(11400 \right)}^{2}}{- \log{\left(23^{\log{\left(400 \right)}} \right)} + \log{\left(20 \right)}^{2} + \log{\left(23 \right)}^{2}}$$
(log(2699)^2 + log(11400)^2 - log(11400^log(7284601)))/(log(20)^2 + log(23)^2 - log(23^log(400)))