Question

решите урвнения
(x+1)²-(x-2)(x+2)=7

Answer 1

(х+1)²- (х-2)(х+2)=7
х²+2х+1 - (х²-4)=7
х²+2х+1-х²+4=7
2х+5=7
2х=7-5
2х= 2
х=1

Проверим: 
(1+1)² -(1-2)(1+2)=7
2²-(-1)*3 =7
4+3=7
7=7