Sr Examen
Descomponer -y^4-4*y^2-14 al cuadrado
Solución
Factorización
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$$\left(x + \left(\sqrt[4]{14} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{10}}{2} \right)}}{2} \right)} - \sqrt[4]{14} i \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{10}}{2} \right)}}{2} \right)}\right)\right) \left(x + \left(\sqrt[4]{14} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{10}}{2} \right)}}{2} \right)} + \sqrt[4]{14} i \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{10}}{2} \right)}}{2} \right)}\right)\right) \left(x + \left(- \sqrt[4]{14} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{10}}{2} \right)}}{2} \right)} + \sqrt[4]{14} i \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{10}}{2} \right)}}{2} \right)}\right)\right) \left(x + \left(- \sqrt[4]{14} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{10}}{2} \right)}}{2} \right)} - \sqrt[4]{14} i \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{10}}{2} \right)}}{2} \right)}\right)\right)$$
(((x + 14^(1/4)*sin(atan(sqrt(10)/2)/2) + i*14^(1/4)*cos(atan(sqrt(10)/2)/2))*(x + 14^(1/4)*sin(atan(sqrt(10)/2)/2) - i*14^(1/4)*cos(atan(sqrt(10)/2)/2)))*(x - 14^(1/4)*sin(atan(sqrt(10)/2)/2) + i*14^(1/4)*cos(atan(sqrt(10)/2)/2)))*(x - 14^(1/4)*sin(atan(sqrt(10)/2)/2) - i*14^(1/4)*cos(atan(sqrt(10)/2)/2))
Expresión del cuadrado perfecto
Expresemos el cuadrado perfecto del trinomio cuadrático
$$\left(- y^{4} - 4 y^{2}\right) - 14$$
Para eso usemos la fórmula
$$a y^{4} + b y^{2} + c = a \left(m + y^{2}\right)^{2} + n$$
donde
$$m = \frac{b}{2 a}$$
$$n = \frac{4 a c - b^{2}}{4 a}$$
En nuestro caso
$$a = -1$$
$$b = -4$$
$$c = -14$$
Entonces
$$m = 2$$
$$n = -10$$
Pues,
$$- \left(y^{2} + 2\right)^{2} - 10$$
$$\left(- y^{4} - 4 y^{2}\right) - 14$$
Para eso usemos la fórmula
$$a y^{4} + b y^{2} + c = a \left(m + y^{2}\right)^{2} + n$$
donde
$$m = \frac{b}{2 a}$$
$$n = \frac{4 a c - b^{2}}{4 a}$$
En nuestro caso
$$a = -1$$
$$b = -4$$
$$c = -14$$
Entonces
$$m = 2$$
$$n = -10$$
Pues,
$$- \left(y^{2} + 2\right)^{2} - 10$$
Unión de expresiones racionales
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2 / 2\ -14 + y *\-4 - y /
$$y^{2} \left(- y^{2} - 4\right) - 14$$
-14 + y^2*(-4 - y^2)