Question

What value completes the square for the expression?

x^2 - 18x

A. 9

B. -9

C. 81

D. -81

Answer 1

I think it's C.

Answer 2

Yeah.

Answer 3

To find the term to complete the square,
1) Divide the expression by the coefficient of x^2 = 1, so it's fine
2) Divide the coefficient of x by 2: -18 / 2 = -9
3) Square the result of question 2: -9 squared = 81.

Yes

Answer 4

Thanks