Question

a) 4c(c-2)-(c-4)^2
b) 3(y-1)^2+6y 

Answer 1

3с^2 - 2с -16

3у^2+ 1

вроде так

Answer 2

$4c(c-2)-(c-4)^2=4c^2-8c-c^2+8c-16=3c^2-16$

 

$3(y-1)^2+6y=3(y^2-2y+1)+6y=3y^2-6y+3+6y=3y^3+3$