Question

Which trinomial is a perfect square trinomial?
(Points : 1)
y^2 + 25y + 200

y^2 + 9y + 81

y^2 + 14y + 49

y^2 + 6y + 36

Answer 1

Just be familiar of this form:
(a+b)^2 = a^2 + 2ab + b^2

Answer 2

Hence, supposedly, the first technique you gonna do is to check whether the first and last term of that trinomial is perfect square.
Then, follow by checking the middle term if when divided by two is equal to the sum of square root of first term and square root of the second term.