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Solve for x.

6^(x/2)=5^(1-x)

1 Answer

1 vote

Hello from MrBillDoesMath!

Answer:

x = log5 / ( (1/2)log6 + log5)

approximately 0.642

Discussion:

Take the logarithm of both sides ( to "pull" the exponents down so we can work on them!)

6^(x/2)) = 5^(1-x)

log ( 6^(x/2)) = log (5^(1-x)) => using log (a^n) = n log a

(x/2) log6 = (1-x) log5 => add x log5 to both sides

(x/2) log6 + xlog5 = log5 - xlog5 + xlog5 =>

(x/2) log6 + xlog5 = log5 => factor x from the lhs

x ( (1/2) log6 + log5) = log5 =>

x = log5 / ( (1/2)log6 + log5)

The above can be further simplified but that's as far as I want to take it.The value of x is approx equal to 0.642


Thank you,

MrB

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