Question

Ill give medal... and maybe a fan

Which polynomial is a perfect square trinomial?

49x2 - 28x + 16
4a2 - 20a + 25
25b2 - 20b - 16
16x2 - 24x - 9

some one help ??

Answer 1

@KiaKat do you can help me ?

Answer 2

I want to say its B but im not sure

Answer 3

@Samuel917 wondering if you could help me??

Answer 4

For each answer choice, do this

take the square root of the first and last coefficients

say we're looking at choice A

the square root of 49 is 7, the square root of 16 is 4.

Multiply these two numbers together to get 7*4 = 28, then double it to get 2*28 = 56


Since this result of 56 is NOT equal to the middle coefficient of 28, this means that choice A is NOT a perfect square (so you can eliminate choice A)

Answer 5

yes I did that for every one of them and I got B ... so is that correct... @Samuel917

Answer 6

(2a - 5)^2

Answer 7

? Im confused

Answer 8

Its B

Answer 9

thanks ...