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Summary Worked Examples of Integration by Partial Fraction Decomposition, Calculus II for Physical Sciences, University of Toronto Scarborough(UTSC)$8.39
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Summary Worked Examples of Integration by Partial Fraction Decomposition, Calculus II for Physical Sciences, University of Toronto Scarborough(UTSC)
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Course
Calculus II For Physical Sciences (MATA36)
Institution
University Of Toronto (U Of T
)
Explanation with examples, of integrating by partial fraction decomposition for Calculus II for Physical Sciences, University of Toronto Scarborough(UTSC)
University of Toronto Scarborough
MATA36
Calculus II for Physical Sciences
Text Book: Calculus Early Transcendentals 9th Edition by James
Stewart, Daniel Clegg, Saleem Watson
Partial fraction decomposition is the breaking down of a fraction into multiple fractions where
the numerator is a constant. The multiple fractions, which are obtained by decomposing, if we
add them, we get the original fraction. This helps in integrating the original fraction.
1
∫ ( x −3)( x+5) dx
First, we decompose the given fraction.
The first step is to factorize the denominator, here, the denominator is already factorized.
1
( x−3)(x +5)
A B
+
( x−3) ( x+ 5)
A and B are two constants, the value of which we have to find out. To do that, multiply both
sides of the equation (decomposed and undecomposed) by the factorized denominator.
1 A B
( x−3)( x +5)=( + )( x−3)( x +5)
( x−3 ) ( x+5 ) ( x−3 ) ( x+ 5 )
1= A ( x+ 5)+ B( x−3)
Now, one strategy is to input certain values to x which will remove one of the constants. For
example, if we input, x=3, then B (3-3) = 0, leaving only the constant A. Repeat the procedure
for the other constant.
Input x = 3,
1= A ( 3+5 )+ B ( 3−3 )
1=8 A
1
A=
8
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