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Grade 12 Advanced Functions, University Preparation (MHF4U)
A. Exponential and Logarithmic Functions
4. 12AF.A1.4
4.3 Combining product rule and quotient rule in logarithms
Combining Product Rule and Quotient Rule in Logarithms
See how to combine the product rule and quotient rule of logarithms in one expression, expanding and condensing logs step by step.
What You'll Learn
The product rule turns the log of a product into a sum of logs, while the quotient rule turns the log of a quotient into a difference of logs.
Many expressions mix multiplication and division inside one log, so both rules must be applied in the same problem.
Always expand multiplication first into addition, then handle division as subtraction, working from the outside in.
To condense logs back into one expression, combine added logs by multiplying their arguments and subtracted logs by dividing them.
Watch the order of operations carefully, since a quotient rule mistake often comes from forgetting to distribute the subtraction across every term in the denominator.
What You'll Practice
1
Combining three or more log terms with mixed addition and subtraction
2
Simplifying expressions by factoring out coefficients before combining logs
3
Evaluating combined log expressions using substituted values
4
Converting between division/multiplication and subtraction/addition in logs
Why This Matters
Combining product and quotient rules lets you simplify complex logarithmic expressions efficiently, a skill essential for solving exponential equations in algebra, calculus, and applied fields like chemistry and physics where logarithmic scales are common.
Before You Start — Make Sure You Can:
This Unit Includes
4 Video lessons
Practice exercises
Learning resources
Skills
Logarithms
Product Rule
Quotient Rule
Simplification
Log Properties
Factoring
Algebraic Manipulation

ON Curriculum Aligned