Questions
Question 1
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Write the correct partial-fraction form for \(\frac{5x+1}{(x-2)(x+3)}\). Do not find the constants.
Question 2
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Write the correct partial-fraction form for \(\frac{x+4}{(x-1)^2}\). Do not find the constants.
Question 3
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Decompose \(\frac{7}{x(x+1)}\) into partial fractions.
Question 4
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Decompose \(\frac{3x+1}{(x-1)(x+2)}\).
Question 5
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Evaluate \(\int \frac{5}{x(x+5)}\,dx\).
Question 6
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Evaluate \(\int \frac{x+4}{(x+1)(x+3)}\,dx\).
Question 7
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Decompose \(\frac{2x+5}{(x-2)^2}\).
Question 8
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Write the correct partial-fraction form for \(\frac{4x^2+1}{(x+1)(x^2+4)}\), then identify the numerator type over \(x^2+4\).
Question 9
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Evaluate \(\int \frac{3x+7}{(x+1)(x+2)}\,dx\).
Question 10
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Evaluate \(\int \frac{x}{(x-1)(x+1)}\,dx\).
Question 11
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Evaluate \(\int \frac{x+3}{x^2(x+1)}\,dx\).
Question 12
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Explain why \(\frac{2x+1}{(x-1)^2(x+4)}\) needs three partial-fraction terms, then write the setup.
Question 13
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Evaluate \(\int \frac{2x^2+x+5}{(x+1)(x^2+4)}\,dx\).
Question 14
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Evaluate \(\int \frac{1}{(x-2)^2(x+1)}\,dx\).
Question 15
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Find \(a\) so that \(\frac{x+a}{(x-1)(x+2)}\) has equal partial-fraction coefficients, then decompose it.
Question 16
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For which \(k\) does \(\frac{kx+6}{(x-3)(x+1)}\) have no \(\frac{1}{x+1}\) term in its partial-fraction decomposition?
Question 17
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Find \(A,B,C\) if \(\frac{4x^2+px+q}{(x-1)(x+2)(x+3)}=\frac{A}{x-1}+\frac{B}{x+2}+\frac{C}{x+3}\) and \(A=1\), \(B=2\). Express \(C,p,q\).
Question 18
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A student decomposes \(\frac{x+1}{(x-2)^2}\) as \(\frac{A}{(x-2)^2}\) only. Explain why this is incomplete and find the correct decomposition.
Question 19
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Prove by coefficient counting why \(\frac{Ax+B}{x^2+4}\) is needed for an irreducible quadratic denominator, not just \(\frac{A}{x^2+4}\).
Question 20
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Evaluate \(\int \frac{3x^2+2x+11}{(x+1)(x^2+9)}\,dx\) and show the decomposition.