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Question

Evaluate the definite integrals.
21(4x35x2+6x+9)dx

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Solution

Let I=21(4x35x2+6x+9)dx
=[4x445x33+6x22+9x]21=[x45x33+3x2+9x]21=[(2)45(2)33+3(2)2+9(2)][(1)45(1)33+3(1)2+9(1)]=[16403+12+18][153+3+9]=[46403][1353]=[138403][3953]=983343=643


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