A) 2c(1+c)-(c-2)(c+4) b) (y+2)²-2y(y+2) Упрастите уравнение

Question

A) 2c(1+c)-(c-2)(c+4)
b) (y+2)²-2y(y+2)
Упрастите уравнение

Answer 1

2c(1+c)-(c-2)(c+4)=2c+2cˇ2-(cˇ2-2c+4c-8)=
=2c+2cˇ2-cˇ2-2c+8=cˇ2+8

(y+2)ˇ2-2y(y+2)=yˇ2+4y+4-2yˇ2-4y=-yˇ2+4= (2+y)(2-y)