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Question

If log10 a=b, find 103b2 in terms of a.

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Solution

log subscript 10 a equals b rightwards double arrow 10 to the power of b equals a rightwards double arrow open parentheses 10 to the power of b close parentheses cubed equals a cubed space space open parentheses c u b i n g space b o t h space s i d e close parentheses rightwards double arrow 10 to the power of 3 b end exponent over 10 squared equals a cubed over 10 squared space space open parentheses d i v i d i n g space b o t h space s i d e space b y 10 squared close parentheses rightwards double arrow 10 to the power of 3 b minus 2 end exponent equals a cubed over 100

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