已知A(5,-4),B(x,4),|AB|=10,则x等于?
问题描述:
已知A(5,-4),B(x,4),|AB|=10,则x等于?
答
|AB|=√[(x-5)^2+(4+4)^2]=10
(x-5)^2+(4+4)^2=100
(x-5)^2=36
x-5=±6
x=11或x=-1