Question

Решите уравнение (х^2– 2)^2–(х^2–2)−6=0.

Answer 1

$x^{4} -4 x^{2} +4- x^{2} +2-6=0 \ \ x^{4} -5 x^{2} =0 \ \ x^{2} ( x^{2} -5)=0 \ x=0 \ \ x^{2} =5 \ \ x1= sqrt{5} \ \ x2=- sqrt{5}$