Which expression is not a perfect square trinomial?Question 2 options:121 plus 11 y plus y squared100 minus 20 y plus y squared81 plus 18 y plus y squared144 plus 24 y plus y squared

Answer:Remember that a perfect square trinomial can be factored into the form (a+b)^2or (a-b)^2Examples:(x+2)(x+2) is a perfect sq trinomial --> x^2+4x+4(x-3)(x-3) is a perfect sq trinomial --> x^2-6x+9(x+2)(x-3) is not a perfect square trinomial because its not in the form (a+b)^2 or (a-b)^2Now to answer your question,for the first one, x^2-16x-64, you cannot factor it so it is not a perfect square trinomialfor the second one, 4x^2 + 12x + 9, you can factor that into (2x+3)(2x+3) = (2x+3)^2 so this is a perfect square trinomialfor the third one, x^2+20x+100 can be factored into (x+10)(x+10) so this is also a perfect square trinomialfor the fourth one, x^2+4x+16 cannot be factored so this is not a perfect square trinomialTherefore, your answer is choices 2 and 3Read more on Brainly.com - explanation: