因式分解(x^2-6x)^2-81
问题描述:
因式分解(x^2-6x)^2-81
答
(x^2-6x)^2-81利用平方差,可得:(x^2-6x+9)(x^2-6x-9)=(x-3)^2(x^2-6x-9)=(x-3)^2(x-3+3根号2)(x-3-3根号2)
答
(x^2-6x)^2-81
=(x^2-6x)^2-9^2
=(x^2-6x+9)(x^2-6x-9)
=(x-3)^2(x^2-6x-9)