Question

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Answer 1

Which polynomial is a perfect square trinomial?
36x2 - 18x - 9
4a2 - 28a - 49
25b2 - 40b + 16
4x2 - 6x + 9

Answer 2

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 3

:)

Answer 4

XD