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9^3x=4^(7x+3) 

Do it step by step, so I can reveiw.

 Feb 10, 2017
 #1
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Solve for x over the real numbers:
9^(3 x) = 4^(7 x + 3)

Take the natural logarithm of both sides and use the identity log(a^b) = b log(a):
6 log(3) x = 2 log(2) (7 x + 3)

Expand out terms of the right hand side:
6 log(3) x = 14 log(2) x + 6 log(2)

Subtract 14 x log(2) from both sides:
(6 log(3) - 14 log(2)) x = 6 log(2)

Divide both sides by 6 log(3) - 14 log(2):
Answer: |x = (6 log(2)) / (6 log(3) - 14 log(2))

 Feb 10, 2017

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