Question

Check all polynomials that are perfect square trinomials:

a. 49x^2 − 8x + 16
b. 4a^2 − 20a + 25
c. 25b^2 − 5b + 10
d. 16x^2 − 8x + 1

Answer 1

b , d

Answer 2

4a^2 − 20a + 25 = (2x - 5)^2
16x^2 − 8x + 1 = (4x - 1)^2

Answer 3

The patterns you are looking for are\[a^2+2ab+b^2=(a+b)^2\]or\[a^2-2ab+b^2=(a-b)^2\]