Question

What values of "b" make the expression x^2+bx+81 a perfect square trinomial?

Answer 1

A perfect square trinomial is a binomial squared like this for example: (x+3)^2 or (y-5)^2

Answer 2

So if yours is going to be a perfect square trinomial, what would we have to put first to get x^2 and what would we have to put last to get 81?

Answer 3

(x+9)^2?

Answer 4

And sorry for not having replied quick enough. :P

Answer 5

perfect!!