x^2+9xy+20y^2

Question

i never deal with something like this before i come up with (x+4)(x+5) but that wrong because y have to be there how i do this?

Answer 1

All you had to do was include a y at the end of each binomial

(x+4y)(x+5y)

(expand it to prove the answer is correct)

Answer 2

oh i get it :D thanks very much reiny :)