Question

Find all positive numbers $x$ such that $\displaystyle{\ln (x^3) = 7}$.

Answer 1

You need to use the rules of logs for this.

ln(x^3)=7
3*ln(x) =ln(7)
3/x=ln(7)
3=ln(7)*(x)
3/ln(7)=x is exact answer to approximate x
x= 1.542

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