Express Quotient Logarithm: We need to express the logarithm of a quotient in terms of the logarithms of the numerator and the denominator.The logarithm of a quotient rule states that logb(ca) is equal to logb(a)−logb(c).Therefore, log4(21) can be written as log4(1)−log4(2).
Evaluate Log 1: Now we need to evaluate log41. The logarithm of any number at its own base is 1, so log44 is 1. Since 1 is the multiplicative identity, log41 is 0.
Evaluate Log 2: Next, we need to evaluate log42. We know that 4 is 2 squared, so we can express 4 as 22. Therefore, log42 is asking us for what power we need to raise 4 to get 2. Since 4 is 2 squared, we need to raise 4 to the power of 41 to get 2. So, log42 is 41.
Combine Results: Now we can combine our results to find the final answer.We have log421 equals log41−log42, which is 0−21.Therefore, log421 is −21.
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