$\"\"$

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(a)

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The logarithmic equation is $\"\"$ .

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Property of natural logarithm: $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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(b)

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The equation is $\"\"$ .

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Consider $\"\"$ .

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Substitute $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$ and $\"\"$ .

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Replace $\"\"$ in above solution.

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$\"\"$ and $\"\"$ .

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

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$\"\"$ and $\"\"$

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$\"\"$ or $\"\"$ .

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$\"\"$

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(a) $\"\"$ .

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(b) $\"\"$ or $\"\"$ .