Question

nancy found that x=1 is one solution to the quadratic equation ((x + 2)^2 = a). what is the value of a?
-9
-3
3
9

Explanation:

Step1: Substitute x=1 into equation

$(1 + 2)^2 = a$

Step2: Calculate left side

$3^2 = 9 = a$

Answer:

9