$\"\"$

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(a).

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The equation is $\"\"$ .

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$\"\"$

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$\"\"$

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Apply power rule of logarithm : $\"\"$ .

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$\"\"$

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Apply logarithm rule : $\"\"$ .

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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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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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(a). The value of $\"\"$ .

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(b). The value of $\"\"$ .