(2x+3)(2x+1)=(x+1)^2+(x+2)^2+x^2+17+(x-1)^2

问题描述:

(2x+3)(2x+1)=(x+1)^2+(x+2)^2+x^2+17+(x-1)^2

2x+3)(2x+1)=(x+1)^2+(x+2)^2+x^2+17+(x-1)^2
4X^2+8X+3=4X^2+4X+23
4X=20
X=5