Posted by **Marie** on Friday, March 9, 2012 at 12:45pm.

Solve by completing the square,

8x^2+4x-4=0

- Math -
**Reiny**, Friday, March 9, 2012 at 12:52pm
divide by 8 and re-arrange

x^2 + (1/2)x = 1/2

x^2 + (1/2)x + 1/16 = 1/2 + 1/16

(x + 1/4)^2 = 9/16

x + 1/4 = ± 3/4

x = -1/4 ± 3/4

= 1/2 or -1

- Math -
**Ann**, Friday, March 9, 2012 at 2:12pm
Reiny,

Im sorry but where is the 1/16 coming from?

- Math -
**Reiny**, Friday, March 9, 2012 at 2:23pm
take half of the middle coefficient , the square it

1/2 of 1/2 is 1/4

1/4 squared is 1/16

I added that to both sides, thus not changing the value of my equation.

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