因式分解,公式法x的2次方(3x+2y)2次方-y2次方(2x+3y)平方

问题描述:

因式分解,公式法
x的2次方(3x+2y)2次方-y2次方(2x+3y)平方

x的2次方(3x+2y)2次方-y2次方(2x+3y)平方
=x²(3x+2y)²-y²(2x+3y)²
=[3x²+2xy-2xy-3y²][3x²+2xy+2xy+3y²]
=(3x²-3y²)(3x²+4xy+3y²)
=3(x+y)(x-y)(3x²+4xy+3y²)

原式对应的方程为2x^2-3x-1=0 解得x1和x2(数字就不算了)则原式=2(x-x1)(x-x2)

=[x(3x+2y)+y(2x+3y)][x(3x+2y)-y(2x+3y)]
=(3x²+4xy+3y²)(3x²-3y²)
=3(3x²+4xy+3y²)(x+y)(x-y)