x[x+1]=50怎么解

问题描述:

x[x+1]=50怎么解

x[x+1]=50
x^2+x=50
(x+1/2)^2=50+1/4
(x-1/2)^2=201/4
x-1/2=√201/2 或 x-1/2=-√201/2
x=(√201+1)/2 或 x=(1-√201)/2