SOLUTION: Please help me on this question. What value completes the blank for the expression x^2-6+__? A)36 B)12 C)9 D)3 Please explain how you got the answer, thanks in advance- Emily

Algebra ->  Expressions-with-variables -> SOLUTION: Please help me on this question. What value completes the blank for the expression x^2-6+__? A)36 B)12 C)9 D)3 Please explain how you got the answer, thanks in advance- Emily      Log On


   

Question 1040601: Please help me on this question.
What value completes the blank for the expression x^2-6+__?
A)36 B)12 C)9 D)3
Please explain how you got the answer, thanks in advance- Emily
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
Please check the question again to see if it is x^2-6X+....
If it is, the answer is 9, because by completing the square, x^2-6x+9 is (x-3)^2.
In instances with completing the square (factoring is one use, parabola construction another), one takes half of the x term in the middle and squares it. Half of -6 is -3, and squared, it is 9.