(8-x)(8-x)+(7-x)(7-x)=25怎么解啊
问题描述：
(8-x)(8-x)+(7-x)(7-x)=25怎么解啊
答
(8-x)(8-x)+(7-x)(7-x)=25
64-16x+x²+49-14x+x²-25=0
2x²-30x+88=0
x²-15x+44=0
(x-11)(x-4)=0
x1=11
x2=4
祝学习进步