Q. Find the numerical value of the log expression.loga=−10logb=10logc=11logc9ab5Answer:
Apply Properties of Logarithms: Apply the properties of logarithms to simplify the expression.We have the expression log(c9ab5). We can use the quotient rule of logarithms, which states that log(BA)=log(A)−log(B), and the power rule of logarithms, which states that log(An)=n⋅log(A), to simplify this expression.
Apply Quotient Rule: Apply the quotient rule to the given expression.Using the quotient rule, we get:log(ab5)−log(c9).
Apply Power Rule: Apply the power rule to the terms inside the logarithms.The square root can be written as a power of 21, and we have c9, so we apply the power rule:log((ab5)21)−9⋅log(c).
Simplify First Term: Apply the power rule to the first term and simplify.21⋅log(ab5)−9⋅log(c).
Apply Product Rule: Apply the product rule to the first term.The product rule states that log(A⋅B)=log(A)+log(B), so we get:21⋅(log(a)+log(b5))−9⋅log(c).
Apply Power Rule to b^5: Apply the power rule to log(b5).21⋅(log(a)+5⋅log(b))−9⋅log(c).
Distribute and Substitute Values: Distribute the 21 and substitute the given values for log(a), log(b), and log(c).21⋅log(a)+25⋅log(b)−9⋅log(c).Substituting the given values:21⋅(−10)+25⋅10−9⋅11.
Perform Arithmetic Operations: Perform the arithmetic operations.−5+25−99.
Combine Terms: Combine the terms to find the final numerical value.−5+25−99=20−99=−79.
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