(x^2-7)^2+2 решите уравнение

(x^2-7)^2+2 = =( (x^2)^2 - 2*x^2*7 + 7^2) + 2 = = x^4 - 14x^2 + 49+2 = = x^4 - 14x^2 + 51-----------------------------------