document.write( "Question 1182692: Give the integral of (2x)/(x^2+x-12) with respect to x. \n" ); document.write( "
Algebra.Com's Answer #812775 by greenestamps(13215)\"\" \"About 
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\n" ); document.write( "Use partial fraction decomposition.

\n" ); document.write( "\"2x%2F%28x%5E2%2B1-12%29+=+A%2F%28x%2B4%29%2BB%2F%28x-3%29\"

\n" ); document.write( "Multiply through by the least common denominator:

\n" ); document.write( "\"2x+=+A%28x-3%29%2BB%28x%2B4%29+=+%28A%2BB%29x%2B%284B-3A%29\"

\n" ); document.write( "Equate the coefficients of the linear and constant terms on the two sides of the equation to get two equation to solve for A and B.

\n" ); document.write( "A+B=2
\n" ); document.write( "4B-3A=0
\n" ); document.write( "3B+3A=6
\n" ); document.write( "7B=6
\n" ); document.write( "B=6/7
\n" ); document.write( "A=8/7

\n" ); document.write( "Rewrite the expression as the sum of two fractions with denominators that are linear polynomials:

\n" ); document.write( "\"2x%2F%28x%5E2%2Bx-12%29+=+%286%2F7%29%2F%28x-3%29%2B%288%2F7%29%2F%28x%2B4%29\"

\n" ); document.write( "Integrate using integral(1/(x-a))= log(x-a) plus a constant.

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