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March 25, 2017

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Use the shell method to set up and evaluate the integral that gives the volume of the solid generated by revolving the plane region about the x-axis:
Y=sqrt(x+2), y=x,y=4

  • calculus - ,

    A rough sketch and some quick easy algebra shows that the curve intersects the lines at (2,2) and (14,4)
    and the two straight lines intersect at (4,4)

    so in 2 parts ....

    V = π∫( x^2 - (x+2) ) dx from 2 to 4 + π∫(16 - (x+2))dx from 4 to 14
    = π [(1/3)x^3 - (1/2)x^2 - 2x] from 2 to 4 + π[ 16x - (1/2)x^2 - 2x] from 4 to 14

    I will let you do the arithmetic

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