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p. (2) log. 1p. x = log x. p. (3) log b4 x2 = log x. b. 9. Given that log 2 = x, log 3 = y and log 7 = z, express the following expressions in terms of x, y, and z.
Question 1 Simplify each of the following logarithmic expressions, giving the final answer as a single logarithm. a) log 7 log 22 2+ b) log 20 log 42 2− c) 3log 2 log 85 5+ d) 2log 8 5log 26 6− e) log 8 log 5 log 0.510 10 10+ − log 142, log 52, log 645, log 26, log 8010
1. Introduction. In this unit we are going to be looking at logarithms. However, before we can deal with logarithms we need to revise indices. This is because logarithms and indices are closely related, and in order to understand logarithms a good knowledge of indices is required.
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Logarithms Study Development Worksheet Answers 1. Using log laws or a calculator, we find: i) )𝑙 𝑔4(16=2 ii) (𝑙 𝑔232)=5 iii) 𝑙 𝑔3(1 3)=𝑙 𝑔3(1)−𝑙 𝑔3(3)=0−1=−1. Alternatively, you may already know that 3−1=1 3, in which case you do not need to separate the logs out. iv) (𝑙 1)=0 v) )𝑙 (10=2.303
A standard logarithm can have any positive number as its base except 1, whereas a natural log is always base e Since the natural log is always base , it will be necessary to use a calculator to evaluate natural logs
1. We often use logarithms for complicated calculatio ns involving large numbers, such as astronomical calculations, or scientific calculations. 2. John Napier discovered logarithms and the logarithm tables are called napier algorithms.
