Question

Which polynomial is a perfect square trinomial?

A) 25x^2 − 20x − 16

B) 9a^2 − 30a − 25

C) 25b^2 − 15b + 9

D) 16x^2 − 24x + 9

Answer 1

Ok! this is not so bad but some times a long problem to do! just trial and error type! the only choice that is a perfect square is D! because it simplifies to (4x-3)^2...how to get there! just use the formula (a+b)^2 = a^2 + 2ab + b^2

Answer 2

thank you!