Question

What integer needs to be added to the expression to create a perfect square? x2 + 14x
A. 7
B. 14
C. 49
D. 196

Answer 1

You have two numbers in question here...
\[\Large \color{red}1x^2 + \color{blue}{14}x\]
You take the number next to the x (the one with NO EXPONENT!)

Take half of that number, and then square it. That's what you add :)