SOLUTION: Can someone please help me solve this? Thank you! to solve by completing the square, what value should you add to each side of the equation? x^2+4x= -9 What value should be a

Question 766421: Can someone please help me solve this? Thank you!
to solve by completing the square, what value should you add to each side of the equation?
x^2+4x= -9
What value should be added to both sides of the equation?
___ ( type an integer or a simplified fraction.)
Answer by Cromlix(4381) (Show Source): You can put this solution on YOUR website!
x^2 + 4x - 9
separate -9
x^2 + 4x ......-9
Halve the number before the x and square it
x^2 + 4x + (4/2)^2.......-9
x^2 + 4x + 4 ...........-9
Now because we have added +4
to the left hand side we must add -4
to the -9
x^2 + 4x + 4.......-4 -9
This then is presented as:-
(x + 2)^2 - 13
Hope this helps.
:-)
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