Question

Упростить выражения! а)(с-2)(с+3)-с^2 б)7(х+8)+(х+8)(х-8) в)(х+5)4х-(2х+5)^2

Answer 1

(c-2)(c+3)-c^2=c^2+3c-2c-6-c^2=c-6

7(х+8)+(х+8)(х-8)=7x+56+x^2-8x+8x-64=x^2+7x-8

(х+5)4х-(2х+5)^2=4x^2+20x-4x^2+20x+25=40x+25