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Find the value of , when:

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answer is A.

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Detailed Solution

Concept- To solve this problem, you need to pay attention to the basic characteristics of the logarithm. If there is an equation

Then

. Where a and b are any two numbers. Therefore, use this property to solve the above problem.
Substitute

in the given expression.

It does not meet RHS 128 in the specified expression.
Let's assign

to the given expression.

It does not meet RHS 128 in the specified expression.
Let's assign

to the given expression.

It does not meet RHS 128 in the specified expression.
Let's assign

to the given expression.

This satisfies RHS 128 of the given expression.
Therefore, the value of

in the specified expression is

Hence, the correct option is 1.

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Find the value of , when:

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