24=x^2-14xx=?
问题描述:
24=x^2-14x
x=?
答
x^2-14x-24=0
x^2-14x+49=24+49
(x-7)^2=73
x=7+根号73
x=7-根号73
答
24=x^2-14x
x^2-14x -24=0
(x-7)^2-73=0
(x-7)^2=73
x-7=±√73
x=7±√73