Question

HELP and show ur work please :)

I think its A, am i right?

Which of the following is not a perfect square trinomial?









A.

169 – 26y + y2








B.

81 + 18y + y2








C.

64 + 8y + y2








D.

25 + 10y + y2

Answer 1

No Choice c is not perfect square!!! Bcouse there are not numbers whose sum is 8 and product is 64!!

Answer 2

a perfect square is the result of squaring something

(x+a)^2 if we expand it into a trinomial we get:

x^2 +2a x + a^2

as such we can see a relationship between the coefficients of the last and middle terms

Answer 3

if you believe its a can you put it in that form
(x-a)^2

Answer 4

(y-a)^2

Answer 5

to transform 2a into a^2 all we need to do is divide by 2 and square

(2a/2)^2 = a^2

Answer 6

i like this working back method amistre

Answer 7

You can write choice a as (y-13)^2

Answer 8

me too, i think it helps to see the mechanics behind the formulas :)

Answer 9

thanks guys for taking ur time to help me :)