Question

用配方法解方程：-x^2+3=5x

Answer 1

-x^2+3=5x

x²+5x=3

x²+5x+6.25=9.25

(x+2.5)²=37/4

x+5/2=±√37／2

x1=(-5+√37)/2,x2=(-5-√37)/2