若|2x-18|+(4-y)²=0,则将m²x-n²y分解因式为

问题描述:

若|2x-18|+(4-y)²=0,则将m²x-n²y分解因式为

由题意:
2x-18=0
4-y=0
解得:
x=9
y=4
m²x-n²y
=9m²-4n²
=(3m+2n)(3m-2n)