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Pearson Algebra 2 Common Core, 2011

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Pearson Algebra 2 Common Core, 2011 View details

3. Rational Functions and Their Graphs

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Exercise 54 Page 523

Use a calculator after applying the Change of Base Formula.

1.39

Practice makes perfect

We want to use the Change of Base Formula to evaluate the given expression. log_b m = log_c m/log_c bIn the above formula, m, b, and c are positive numbers, with b≠ 1 and c≠ 1. We will apply this formula to our expression. log_7 15 = log 15/log 7 Recall that if the base of a logarithm is not stated, it is 10. For example, log 15 = log_(10) 15. Logarithms with this base are called common logarithms, and can be found using a calculator.

log 15/log 7

Calculate logarithm

1.1760912591/0.84509804

Use a calculator

1.3916625094

Round to 2 decimal place(s)

1.39

Subchapter links

Lesson Check p.521

Practice and Problem-Solving Exercises p.521-523

Standardized Test Prep p.523