Which polynomial is a perfect square trinomial?
A. 9x2 − 12x + 4

B. 36b2 − 24b + 16

C. 16x2 − 24x − 9

D. 4a2 − 10a − 25

Question

Which polynomial is a perfect square trinomial?
A. 9x2 − 12x + 4

B. 36b2 − 24b + 16

C. 16x2 − 24x − 9

D. 4a2 − 10a − 25

parthkohli · Answer

Factor all of them, and look at the one which looks like $(\cdots )^2$.

anonymous · Answer

THE best way is to find discriminant

anonymous · Answer

if discriminant = 0 then it is a perfect square trinomial

parthkohli · Answer

Oh, that one too ... but I recommend this to start with, because it improves basic understanding.

anonymous · Answer

discriminant?

parthkohli · Answer

^ There you go. Should start with basic, y'know? :)

anonymous · Answer

Oh.... my mistake

parthkohli · Answer

Discriminant-ing is pretty easy, but I'd see if you can factor them.

anonymous · Answer

what does discriminant mean?

parthkohli · Answer

All right--let me give a try for the discriminant method. 
@TaylorxD Do you know the standard form of a quadratic expression?

anonymous · Answer

no, i havent gotten that far in algebra 1.

parthkohli · Answer

Then just factor all, and tell me what you get when you factor them. Hint: you can make it easy by using http://wolframalpha.com

anonymous · Answer

well, i am not really sure how to do that either. i am taking the class online and it doesnt give a very good explanation.