Question

Which of the following is not a perfect square trinomial?
144 + 12y + y2
100 + 20y + y2
64 − 16y + y2
25 + 10y + y2

Answer 1

@amistre64

Answer 2

As an example: 64-16y+y^2:
Is 64 a perfect square? If so, what is its square root? Call it a.
Is y^2 a perfect square? If so, what is its square root? Call it b.
Write out the factors: (a-b)(a+b).
Multiply these two binomials together: a^2 -2ab + b^2.
If your -2ab is the same as your -16y, then 64-16y+y^2 is a perfect square trinomial.

To re-cap: identify your a and your b. Multiply them together. Is their product equal to -16y (except for sign)? If yes, then 64-16y+y^2 is a perfect square.

Check the other three trinomials in the same way.

Answer 3

i don't get it...:(

Answer 4

expnad out a binomial that is squared. a perfect square is just some value, squared.

(y+a)^2 = (y+a)(y+a)

expand that out to a polynomial to compare parts

Answer 5

this is going to take a while for me to learn.

Answer 6

aa + (a+a)y + y^2

which option does not follow this rule: the factor (a) is doubles to get (a+a)

Answer 7

start by assessing the sqrts of the constants

Answer 8

c?

Answer 9

c means nothing to me, lets work a process.

give me a list of the sqrts of the constants

Answer 10

Compare these two trinomial expressions:
aa + (a+a)y + y^2
8*8 + (8+8)y +y^2=64+16y+y^2. (This is one of your answer choices.)
What is " a " in this case?
Is 64+16y+y^2 a perfect square trinomial?

Answer 11

yes it is. am i correct?

Answer 12

there is only one way i would know if you are correct, and that would be to do a simple 3 step process ... step one, take the square roots of the constants, step 2, double the results. step 3 pick the correct answer.

Answer 13

Since you continue to ask whether your answer is correct or not, I'll take a different approach: Please explain how you decided that " c " is the correct answer.

Answer 14

I guessed

Answer 15

I have a lot of stress on me from preparing you PASS testing and its driving me insane

Answer 16

I have three papers to write and my teachers are breathing down my neck

Answer 17

and i dont get any of this math

Answer 18

I spent several minutes trying to explain the problem up front. If you don't understand what I wrote, ask some questions; the answers may help you to understand the problem better.