分解因式9(x+y)^2-25x^4

问题描述:

分解因式9(x+y)^2-25x^4

你好,
9(x+y)²-25x⁴
=[3(x+y)]²-(5x²)²
=[3(x+y)+5x²][3(x+y)-5x²]
=(3x+3y+5x²)(3x+3y-5x²)