Answer:
A) 121 + 11y + y^2
Explanation:
The perfect square trinomial in the form (a + b)^2 and (a-b)^2
(a + b)^2 = a^2 + 2ab + b^2
(a - b)^2 = a^2 -2ab + b^2
In the given options 121 + 11y + y^2 cannot be perfect square trinomial
Others are perfect square trinomials.
81 + 18y +y^2 = (y + 9)^2
100 - 20 y + y^2 = (y - 10)^2
144 + 24y +y^2 = (y +12)^2
So the answer is A) 121 + 11y + y^2
Hope this will helpful.