SOLUTION: Please help me solve: 3x^2-12x-13=0 by completing the square.

Question 587558: Please help me solve: 3x^2-12x-13=0 by completing the square.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!

Add to both sides

Divide both sides by

Take 1/2 of the coefficient of ,
square it, and add it to both sides

Take the square root of both sides

and also

These are the 2 solutions
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I will check by using approximate values

Plugging this back into original equation

I believe the error is due to rounding off
You can check the other solution
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