因式分解,(x²-5)²-16x²

问题描述:

因式分解,(x²-5)²-16x²

(x²-5)²-16x²
=[(x^2-5)+4x][(x^2-5)-4x]
=(x^2+4x-5)(x^2-4x-5)
=(x+5)(x-1)(x-5)(x+1)