Question

Which of the following numbers must be added to complete the square in the

equation below?
x^2 +9x+15 = 11
A.-81/4
B.9/2
C.81/4
D. 81

Answer 1

C

Explanation:

Take the coefficient of the linear term and divide it by 2

9/2

Then square it 81/4

That should either be added to the 11 or subtracted from the 15.

The answer is C