Expand functions: We are asked to evaluate the definite integral of the function (x+2)2−(x2)2 from x=−1 to x=2. The first step is to expand the functions inside the integral before integrating.
Separate into individual terms: Expand (x2)2:(x2)2=x4
Integrate each term: Substitute the expanded forms into the integral: V=π⋅∫−12(x2+4x+4−x4)dx
Apply limits of integration: Separate the integral into individual terms:V=π⋅(∫−12x2dx+∫−124xdx+∫−124dx−∫−12x4dx)
Evaluate at upper and lower limits: Integrate each term separately:∫x2dx=31x3∫4xdx=2x2∫4dx=4x∫x4dx=51x5
Perform calculations: Apply the limits of integration to each term: V=π⋅([31x3]−12+[2x2]−12+[4x]−12−[51x5]−12)
Simplify the expression: Evaluate each term at the upper and lower limits and subtract: V=π⋅(31(2)3−31(−1)3+2(2)2−2(−1)2+4(2)−4(−1)−51(2)5+51(−1)5)
Multiply by pi: Perform the calculations:V=π×((31)(8)−(31)(−1)+2(4)−2(1)+8−(−4)−(51)(32)+(51)(−1))
Multiply by pi: Perform the calculations:V=π×((31)(8)−(31)(−1)+2(4)−2(1)+8−(−4)−(51)(32)+(51)(−1))Simplify the expression:V=π×((38)+(31)+8−2+8+4−(532)−(51))V=π×((39)+6+12−(533))V=π×(3+6+12−(533))V=π×(21−(533))V=π×(5105−533)V=π×(572)
Multiply by pi: Perform the calculations:V=π×((31)(8)−(31)(−1)+2(4)−2(1)+8−(−4)−(51)(32)+(51)(−1))Simplify the expression:V=π×((38)+(31)+8−2+8+4−(532)−(51))V=π×((39)+6+12−(533))V=π×(3+6+12−(533))V=π×(21−(533))V=π×(5105−533)V=π×(572)Multiply by pi to get the final answer:V=π×(572)V=(572)π
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