You can put this solution on YOUR website! 39. lnx+lnx^2=3
ln(x^3) = 3
x^3 = e^3
x = e
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The answer is {e}, but hot did they get that?
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41. logx+log(x-21)=2
log(x(x-21)) = 2
log(x^2-21x) = 2
x^2-21x=10^2
x^2-21x-100 = 0
(x-25)(x+4) = 0
x=25 or x=-4
But x cannot be -4 as that would give you log(-4) in the problem;
log(-4) is meaningless.
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Cheers,
Stan H.
The answer is {25}, but how did they get that?
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