I understand a little bit on how to do this, I just need help.
I'm pretty sure it's a... But I don't know. Help?
81+18y+y^2
100-20y+y^2
144+24y+y^2
121+11y+y^2
Which expression is NOT a perfect square trinomial?

Question

I understand a little bit on how to do this, I just need help.
I'm pretty sure it's a... But I don't know. Help?
81+18y+y^2
100-20y+y^2
144+24y+y^2
121+11y+y^2
Which expression is NOT a perfect square trinomial?

hungergames13 · Answer

it should be 121+11y+y^2

anonymous · Answer

Okay, how did you come up with this reasoning? @hungergames13

hungergames13 · Answer

because (a+b)^2=a^2+2ab+b^2

hungergames13 · Answer

It would be a perfect square trinomial if it was 121 + 22y + y²

anonymous · Answer

Is it because you can't factor 121 and 11?

hungergames13 · Answer

I don't know thats just the answer that I belive is right

anonymous · Answer

Okay, last question, can you use one of the perfect square trinomials and show me how to factor it so I can figure out the next one on my own?

anonymous · Answer

@hungergames13

hungergames13 · Answer

ok

hungergames13 · Answer

so like an example to show you how?

anonymous · Answer

Yes

hungergames13 · Answer

this web site helped me out a lot let me share it with you http://www.basic-mathematics.com/factoring-perfect-square-trinomials.html

anonymous · Answer

Thank you! :)

hungergames13 · Answer

your welcome