Calculators and logs Logarithmic equations

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Presentation transcript:

Calculators and logs Logarithmic equations Logarithms (3) Calculators and logs Logarithmic equations

Using your calculator… The log key on your calculator works out logs to base 10. What would you expect your calculator output if you input the following: Log(100) Log(1000) Log(1)

Solving log equations Solve 3x = 35 Take log of both sides For convenience we use log10 Take log of both sides Using log laws Re-arrange Using your calculator

Solving log equations Solve 53x+7 = 89 Take log of both sides Using log laws Re-arrange Using your calculator Solving…

Solve the following.. Activity 1 Time allowed – 5 minutes x = 2.23 43x+1 = 5x

Activity 2 Time allowed – 5 minutes I earn 3% interest on my savings per year. How long will it take for me to double my savings?