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Question

Solve each equation or inequality. 2x1=52 ^ { x - 1 } = 5

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2x1=52^{x-1}=5

Take the natural log of both sides

ln2x1=ln5\ln2^{x-1}=\ln5

Recall that: logabn=nlogab\text{\color{#c34632}Recall that: $\log_ab^n=n\log_ab$}

(x1)ln2=ln5\left(x-1\right)\ln2=\ln5

Divide both sides by ln2\ln2

x1=ln5ln2x-1=\dfrac{\ln5}{\ln2}

Recall that: logcblogca=logab\text{\color{#c34632}Recall that: $\dfrac{\log_cb}{\log_ca}=\log_ab$}

x1=log25x-1=\log_25

Add 1 on both sides

x=1+log25x=1+\log_25

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