Question

knowledge check
what number needs to be added to each side to complete th
$x^2 + 6x = -8$
a. 6
b. 3
c. 9
d. 8

Explanation:

Step1: Identify coefficient of $x$

Coefficient of $x$ is $6$.

Step2: Calculate half the coefficient

$\frac{6}{2}=3$

Step3: Square the result

$3^2=9$

Answer:

c. 9