Question

1)(C-2)(C+3)-(C-1)^2

Answer 1

$left(C-2right)left(C+3right)-left(C-1right)^2$
$left(C-2right)left(C+3right)-left(C^2-2C+1right)$
$C^2+C-6-left(C^2-2C+1right)$
$C^2+C-6-C^2+2C-1$
$3C-7$

Answer 2

(c²+3c-2c-6)-(c²-2c+1)=c²+ c - 6 - c² - 2c + 1=-c -5