Question

which value must be added to the expression (x^2 + 12x) to make it a perfect - square trinomial?
( \bigcirc 6)
( \bigcirc 36)
( \bigcirc 72)
( \bigcirc 144)

Explanation:

Step1: Identify linear term coefficient

The linear term is $12x$, so coefficient is $12$.

Step2: Half the coefficient

$\frac{12}{2}=6$

Step3: Square the result

$6^2=36$

Answer:

B. 36