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Question 321856: Please help me solve this equation: 64x^2-128x-64
note: it is -128x not -28x
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! solve this equation:
64x^2-128x-64 = 0
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Factor:
64(x^2-2x-1) = 0
Divide by 64 to get:
x^2-2x-1 = 0
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Quadratic Formula:
x = [2 +- sqrt(4-4*1*-1)]/2
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x = [2 +- sqrt(8)]/2
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x = [2 +- 2sqrt(2)]/2
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x = 1 + sqrt(2) or x = 1-sqrt(2)
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Cheers,
Stan H.
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