(2x+7)(7-2x)-49+x*(x+2)

Question

(2x+7)(7-2x)-49+x*(x+2)

Answer 1

1) (  2X + 7 )*( 7 - 2X ) = 14X - 4X^2 + 49 - 14X = - 4X^2 + 49 
2) X * ( X + 2 ) = X^2 + 2X 
3) - 4X^2 + 49 + X^2 + 2X = - 3X^2 + 2X + 49