Solve it like thus Example Find the integral S x 9 x2 18x 9 dx Solution Let u x2 18x 9 Then du (2x 18) d Rewriting the integral 1 x2 18x 9 (x 9) dx 1 x2 18x 9 2 (x 9) dx After the substitution, we have S du Integrating, we have Inlul C Back substituting, we have In x2 18x 9 C

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Solve it like thus Example Find the integral S x 9 x2 18x 9 dx  Solution  Let u   x2   18x   9  Then du   (2x   18) d Rewriting the integral  1 x2 18x 9 (x   9) dx 1   x2  18x   9 2 (x   9) dx After the substitution, we have   S   du  Integrating, we have   Inlul   C Back substituting, we have   In x2   18x   9    C

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Question: Solve it like thus Example Find the integral S x+9 x2+18x-9 dx. Solution: Let u = x2 + 18x - 9. Then du = (2x

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