Question

Which polynomial is a perfect square trinomial?

36x2 − 18x − 9

4a2 − 28a − 49

25b2 − 40b + 16

4x2 − 6x + 9

Answer 1

A

Answer 2

No it is D

Answer 3

LOL xD

Answer 4

both wrong..

Answer 5

Trust me it is D

Answer 6

Hahaha :D

Answer 7

It's C xD

Answer 8

\[(ax+b)^2 = ax^2 +2ab + b^2\]

Answer 9

why are we giving out answers?

Answer 10

6 divided by 2 it 3. And 3 squared is 9

Answer 11

25b2 − 40b + 16
(5b)^2-2(5b)(4)+(4)^2
(5b-4)^2

Answer 12

its C

Answer 13

Yaaaayyyy I won xD

Answer 14

Take b.

\[\large 4a^2-28a-49\]\[\large a^2 =4a^2\]\[\large b^2 = 49\]
\[\large a^2-b^2\] Doesnt fit the form.

try c.
\[\large a^2-b^2 = a^2 -2ab+b^2 \]\[\large a^2 = 25a^2 \ \therefore \ a= 5a\]\[\large b^2 = 16 \ \therefore \ b=4\]put it into our form of difference of squares.

Answer 15

listen to professor beanhead she got this

Answer 16

I'll explain :)
36x2 − 18x − 9
The formula is (x-2)^2 = x^2-4x+4
So plus should be in the end but there is minus so this can't be the perfect square xD

4a2 − 28a − 49
Same case minus is there instead of plus

25b2 − 40b + 16
This is perfect square because
25b2 − 40b + 16
(5b)^2-2(5b)(4)+(4)^2
(5b-4)^2

4x2 − 6x + 9
This even cant be the perfect square

So, option C is the answer xD

Answer 17

Good job.