Question

(X+1)(x+5)-(x+1)(2x+1)

Answer 1

$(x + 1)(x + 5) - (x + 1)(2x + 1)$

$= (x + 1)(x + 5 - 2x - 1)$

$=( x + 1)( - x + 4)$

$= - {x}^{2} + 4x - x + 4$

$= - {x}^{2} + 3x + 4$

Answer 2

(x+1)(x+5)-(x+1)(2x+1)=
(x+1)(x+5-2x-1)=
(x+1)(-x+4)=
-x²+4x-x+4=
-x²+3x+4