Which of the following is not a perfect square trinomial?
121 + 11y + y2
81 + 18y + y2
100 – 20y + y2
144 + 24y + y2

A) 121 + 11y + y^2

Step-by-step 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.

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