/ / / ___\\ / / ___\\\ / / / ___\\ / / ___\\\ / / / ___\\ / / ___\\\ / / / ___\\ / / ___\\\
| | |\/ 7 || | |\/ 7 ||| | | |\/ 7 || | |\/ 7 ||| | | |\/ 7 || | |\/ 7 ||| | | |\/ 7 || | |\/ 7 |||
| |atan|-----|| |atan|-----||| | |atan|-----|| |atan|-----||| | |atan|-----|| |atan|-----||| | |atan|-----|| |atan|-----|||
| ___ | \ 3 /| ___ | \ 3 /|| | ___ | \ 3 /| ___ | \ 3 /|| | ___ | \ 3 /| ___ | \ 3 /|| | ___ | \ 3 /| ___ | \ 3 /||
|x + \/ 2 *cos|-----------| + I*\/ 2 *sin|-----------||*|x + \/ 2 *cos|-----------| - I*\/ 2 *sin|-----------||*|x + - \/ 2 *cos|-----------| + I*\/ 2 *sin|-----------||*|x + - \/ 2 *cos|-----------| - I*\/ 2 *sin|-----------||
\ \ 2 / \ 2 // \ \ 2 / \ 2 // \ \ 2 / \ 2 // \ \ 2 / \ 2 //
$$\left(x + \left(\sqrt{2} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{7}}{3} \right)}}{2} \right)} - \sqrt{2} i \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{7}}{3} \right)}}{2} \right)}\right)\right) \left(x + \left(\sqrt{2} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{7}}{3} \right)}}{2} \right)} + \sqrt{2} i \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{7}}{3} \right)}}{2} \right)}\right)\right) \left(x + \left(- \sqrt{2} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{7}}{3} \right)}}{2} \right)} + \sqrt{2} i \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{7}}{3} \right)}}{2} \right)}\right)\right) \left(x + \left(- \sqrt{2} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{7}}{3} \right)}}{2} \right)} - \sqrt{2} i \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{7}}{3} \right)}}{2} \right)}\right)\right)$$
(((x + sqrt(2)*cos(atan(sqrt(7)/3)/2) + i*sqrt(2)*sin(atan(sqrt(7)/3)/2))*(x + sqrt(2)*cos(atan(sqrt(7)/3)/2) - i*sqrt(2)*sin(atan(sqrt(7)/3)/2)))*(x - sqrt(2)*cos(atan(sqrt(7)/3)/2) + i*sqrt(2)*sin(atan(sqrt(7)/3)/2)))*(x - sqrt(2)*cos(atan(sqrt(7)/3)/2) - i*sqrt(2)*sin(atan(sqrt(7)/3)/2))
Expresión del cuadrado perfecto
Expresemos el cuadrado perfecto del trinomio cuadrático
$$\left(x^{4} - 3 x^{2}\right) + 4$$
Para eso usemos la fórmula
$$a x^{4} + b x^{2} + c = a \left(m + x^{2}\right)^{2} + n$$
donde
$$m = \frac{b}{2 a}$$
$$n = \frac{4 a c - b^{2}}{4 a}$$
En nuestro caso
$$a = 1$$
$$b = -3$$
$$c = 4$$
Entonces
$$m = - \frac{3}{2}$$
$$n = \frac{7}{4}$$
Pues,
$$\left(x^{2} - \frac{3}{2}\right)^{2} + \frac{7}{4}$$