MathematicsChapter 3: Integration
Partial Fractions: Linear Factors
Decompose a proper rational function into simple fractions, then solve constants.
Learning objectives
- State the rule for partial fractions: linear factors.
- Solve a partial fractions: linear factors problem step by step.
- Check the result, restrictions, notation, and units.
Definition
Decompose a proper rational function into simple fractions, then solve constants.
Formula
integral=ln
Where / symbols
- Partial fractions: linear factors
- Decompose a proper rational function into simple fractions, then solve constants.
CONCEPT AND RULE
Decompose a proper rational function into simple fractions, then solve constants.
METHOD
For partial fractions: linear factors, identify the given information and required result. Select the matching definition or formula, state its conditions, substitute carefully, simplify one line at a time, and check.
WORKED EXAMPLE
1/[x(x+1)]=1x-1x+1, so integral=ln|x|-ln|x+1|+C.
COMMON MISTAKE
Write the governing rule before substitution, keep brackets and signs visible, and check that the answer satisfies all domain or interval conditions.
How to solve partial fractions: linear factors
- Identify the mathematical objects, givens, restrictions, and required result.
- Choose and write the relevant definition, theorem, or formula.
- Substitute with brackets and carry out one justified step per line.
- Simplify, state the final answer clearly, and verify it in the original setting.
Worked example
- Worked example:
- 1/[x(x+1)]=1x-1x+1, so integral=ln|x|-ln|x+1|+C.
In simple words
Write the governing rule before substitution, keep brackets and signs visible, and check that the answer satisfies all domain or interval conditions.
Key points
- Partial fractions: linear factors
- rule
- worked example
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Partial Fractions: Linear Factors
Sticky Notes · Formula and Worked Revision
Core Idea
- Decompose a proper rational function into simple fractions, then solve constants.
Rule / Formula
- Decompose a proper rational function into simple fractions, then solve constants.
Method
- Identify givens and restrictions.
- Write the rule.
- Substitute and simplify.
- Check the result.
Worked Example
- 1/[x(x+1)]=1x-1x+1, so integral=ln|x|-ln|x+1|+C.
Common Error
- Write the governing rule before substitution, keep brackets and signs visible, and check that the answer satisfies all domain or interval conditions.
FBISE Exam Tip
- Show the formula, substitutions, algebra, restrictions, and final answer; method marks need visible reasoning.
60-second revision
- Decompose a proper rational function into simple fractions, then solve constants.
- Worked pattern: 1/[x(x+1)]=1x-1x+1, so integral=ln|x|-ln|x+1|+C.
- Final check: domain, sign, notation, units, and reasonableness.
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