Question 1029197: Log2 (x+20) - log2 (x+2) = log2 x
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Log2 (x+20) - log2 (x+2) = log2 (x)
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log2[(x+20)/(x+2)] = log2(x)
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Take the anti-log of both sides to get:
(x+20)/(x+2) = x
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x^2 + 2x = x+20
x^2 + x - 20 = 0
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(x+5)(x-4) = 0o
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Acceptable solution:
x = 4
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Cheers,
Stan H.
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