Question

What number should be added to the expression x^2 + 6x to change the it into a perfect square trinomial?

options
6 , 3 , 9 , 12
(Can choose multiple answers)

Answer 1

9

Explanation:

(A+B)^2 = A^2 + 2AB + B

X^2 + 6X + 9 = (X + 3) (X + 3)