Question

решите уравнение(подробно пж):
(х ^2 – 5)^2 – 2(х^ 2 – 5) − 8 = 0.

Answer 1

$t {}^{2} - 2t - 8 = 0 \\ t = 4 \\ t = - 2 \\ {x}^{2} - 5 = 4 \\ {x}^{2} - 5 = - 2 \\ x = 3 \\ x = - 3 \\ x = \sqrt{3} \\ x = - \sqrt{3}$
x1=-3, x2=-√3, x3=√3, x4=3