Which expression is not a perfect square trinomial?

question 2 options:

121 plus 11 y plus y squared

100 minus 20 y plus y squared

81 plus 18 y plus y squared

144 plus 24 y plus y squared

A. 121 plus 11 y plus y squared;

Step-by-step explanation:

We are asked to choose the expression that is not a perfect square trinomial.

We know that a perfect square trinomial is in form .

A. 121 plus 11 y plus y squared

For this expression to be a perfect square trianomal, the middle term needs to be . Since the middle term is not equal to , therefore, option A is not a perfect square trinomial.

B. 100 minus 20 y plus y squared

Therefore, option B is a perfect square trinomial.

C. 81 plus 18 y plus y squared

Therefore, option C is a perfect square trinomial.

D. 144 plus 24 y plus y squared

Therefore, option D is a perfect square trinomial.