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solve simple equations requiring the use of logarithms. Why do we study logarithms ? What is a logarithm ? 4. Exercises. 5. The first law of logarithms. 6. The second law of logarithms. 7. The third law of logarithms. 8. 9. 10. 11. 12. 13. 14. 1. Introduction. In this unit we are going to be looking at logarithms.
We use logarithms to write expressions involving powers in a different form. If you can work confi-dently with powers you should have no problems handling logarithms. In this statement we say that 10 is the base and 2 is the power or index. Logarithms are simply an alternative way of writing a statement such as this. We rewrite it as.
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
4 Free worksheets with answer keys on logarithms. Each one has model problems worked out step by step, practice problems and challenge proglems.
Rewrite each equation in logarithmic form. Evaluate each expression. Sketch the graph and identify the domain and range of each. 1. a. Evaluate log27. b. Evaluate . 2. Most tornadoes last less than an hour and travel less than 20 miles.
Expand the following logarithms using one or more of the logarithm rules. Sometimes you need to write an expression as a single logarithm. Use the rules to work backwards. log3x2 + log3y . Use the Product Rule for Logarithms. Use the Power Rule for Logarithms. Simplify. Use the Quotient Rule for Logarithms. Simplify. Write as a single logarithm.
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
