Unit 12 · Class 9 IB MYP · Formula Sheet

Logarithms Formulas — Class 9 IB MYP

Define logarithms, apply laws of logarithms, and solve exponential equations.

Key Formulas

Definition

\log_a b = c \iff a^c = b

Product Rule

\log_a(mn) = \log_a m + \log_a n

Quotient Rule

\log_a\left(\dfrac{m}{n}\right) = \log_a m - \log_a n

Power Rule

\log_a(m^n) = n\log_a m

Change of Base

\log_a b = \dfrac{\log_c b}{\log_c a}

Worked Examples

1Using: Application

Apply the key formula from this topic to a sample problem.

Step 1: Identify the formula.

Step 2: Substitute the values.

Step 3: Simplify to get the answer.

Answer: See solution above

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Frequently Asked Questions

How many formulas are in Class 9 IB MYP Logarithms?+

There are 5 formulas in the Logarithms chapter for Class 9 IB MYP. Each formula is essential for solving problems in this topic.

How to remember Logarithms formulas easily?+

Practice regularly with worked examples, group related formulas together, and use SparkEd's interactive practice mode to reinforce your memory through problem-solving.

Are these Logarithms formulas enough for exams?+

Yes, these formulas cover the complete IB MYP Class 9 syllabus for Logarithms. Practice applying them to different types of questions for full exam readiness.

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