$\"\"$

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(a)

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The logarithm equation is $\"\"$ .

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$\"\"$ .

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Definition of logarithm : If $\"\"$ and $\"\"$ are positive real numbers and $\"\"$ , then $\"\"$ is equivalent to $\"\"$ .

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$\"\"$

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In an exponential equation $\"\"$ if and only if $\"\"$ .

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$\"\"$

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Thus, the value of $\"\"$ is $\"\"$ .

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$\"\"$

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(b)

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The logarithm equation is $\"\"$ .

\

$\"\"$ .

\

Definition of logarithm : If $\"\"$ and $\"\"$ are positive real numbers and $\"\"$ , then $\"\"$ is equivalent to $\"\"$ .

\

$\"\"$

\

$\"\"$

\

In an exponential equation $\"\"$ if and only if $\"\"$ .

\

$\"\"$

\

Thus, the value of $\"\"$ is $\"\"$ .

\

$\"\"$

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

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