Question

Which of the following is a perfect square trinomial?

a. x^2+10x+25
b. x^2+6x+13
c. x^2+100
d. x^2+3x+9

Answer 1

a. x² + 10x + 25

Explanation:

because

(x + 5)² = (x + 5)(x + 5) = x² + 5x + 5x + 25 = x² + 10x + 25

so, it is a perfect square of (x + 5).