$\"\"$

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(a)

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The equation is $\"\"$ .

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Take natural logarithm on each side.

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$\"\"$

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The solution of the equation $\"\"$ is $\"\"$ .

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$\"\"$

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(b)

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The equation is $\"\"$ .

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Property of natural logarithm: $\"\"$ if and only if $\"\"$ .

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$\"\"$

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Take natural logarithm on each side.

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$\"\"$

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The solution of the equation $\"\"$ is $\"\"$ .

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$\"\"$

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(a) The solution of the equation $\"\"$ is $\"\"$ .

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(b) The solution of the equation $\"\"$ is $\"\"$ .