(x + 4)x + 5)write the equivalente expression

Question

`(x + 4)x + 5)`write the equivalente expression

Answer 1

given that (x+4) (x+5) and they are asking for equivalent form.

at first both terms are in multiplication form,so multiply x with (x+5) so we get that

`(x+4)(x+5)=x^2+5x+4x+20=x^2+9x+20`