Question

( x + 4 ) (x + 5 ) is​

Answer 1

$(x + 4)(x + 5) \\ = {x}^{2} + (4 + 5)x + (4)(5) \\ = {x}^{2} + 9x + 20$

Hence,

(x + 4)(x + 5) = x² + 9x + 20

Answer 2

SOLUTIONS

$= > (x + 4)(x + 5) \\ = > x(x + 5) + 4(x + 5) \\ = > {x}^{2} + 5x + 4x + 20 \\ = > {x}^{2} + 9x + 20 \\ = > {x}^{2} + 5x + 4x + 20 \\ = > x(x + 5) + 4(x + 5) \\ = > (x + 5) \: \: (x + 4)$

hope it helps ☺️