Q. Find the numerical value of the log expression.loga=−3logb=−11logc=8logb4c53aAnswer:
Apply Properties of Logarithms: Let's start by applying the properties of logarithms to the expression log(b4c53a).We can use the quotient rule of logarithms, which states that log(yx)=log(x)−log(y), and the power rule, which states that log(xk)=k⋅log(x).
Apply Quotient Rule: First, apply the quotient rule to the given expression:log(b4c53a)=log(3a)−log(b4c5).
Apply Power Rule: Next, apply the power rule to the terms log(b4) and log(c5):log(3a)−log(b4c5)=log(3a)−(4⋅log(b)+5⋅log(c)).
Express as Power of a: Now, we need to express log(3a) as a power of a:Since 3a=a1/3, we can write log(3a) as 31⋅log(a).
Substitute Given Values: Substitute the given values of log(a), log(b), and log(c) into the expression:31⋅log(a)−(4⋅log(b)+5⋅log(c))=31⋅(−3)−(4⋅(−11)+5⋅8).
Perform Arithmetic Operations: Perform the arithmetic operations:31⋅(−3)−(4⋅(−11)+5⋅8)=−1−(−44+40)=−1−(−4)=−1+4=3.
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