Question

Найдите ноли функции(Y=0) X^4-6X^2=7 - (^4)(^2) - степени

Answer 1

$x^2=t\ t^2-6t-7=0\ D=36+28=64\ t_1=(6+8):2=7\ t_2=(6-8):2=-1\ x^2=7\ x_1= sqrt{7}\ x_2=- sqrt{7}$