SOLUTION: solve 4x^2 + 12x - 7=0 by completing the square.

Question 210058: solve 4x^2 + 12x - 7=0 by completing the square.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
solve 4x^2 + 12x - 7=0 by completing the square
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4(x^2 + 3x + ?) = 7 + 4*?
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4(x^2 + 3x + (3/2)^2) = 7 + 4(3/2)^2
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4(x+(3/2))^2 = 16
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(x+(3/2)) = +-sqrt(4)
(x+(3/2) = +-2
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x = 1/2 or x = -7/2
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Cheers,
Stan H.
Reply to stanbon@comcast.net
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