Question 255028
3^x=15 (find x) 
>x=log₃15
>x=log₃(3x5)
>x=log₃3 + log₃5
>x= 1 + log₃5
= 1 + (log(5)/log(3))
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Second line should be
x log3 = log 15 giving
x = log 15 / log 3 = 1.1770 / 0.4771
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The result is the same, but Greenfinch's method is faster and simpler.
= 2.46497...