Question

which value must be added to the expression $x^2 + 16x$ to make it a perfect - square trinomial?\
\bigcirc 8\
\bigcirc 32\
\bigcirc 64\
\bigcirc 256

Explanation:

Step1: Identify coefficient of x

The coefficient of $x$ is 16.

Step2: Divide coefficient by 2

$\frac{16}{2}=8$

Step3: Square the result

$8^2=64$

Answer:

C. 64