Algebra HELP PLEASE

A cylinder has a radius of 4x + 2 and a height of 5x — 4. Which polynomial in standard form
best describes the total volume of the cylinder?

A.80pix^3+144pix^2+84pix+16pi
B.20pix^2+26pix+8pi ****
C.80pix^3+144pix^2+84pix-16pi
D.400pix^4+1040pix^3+996ix^3+416pix+64pi



My answer has the "***"by it. Please check my answer

Thanks
:)

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  1. Volume = Pi r^2 h
    = Pi (4x+2)^2 (5x-4)
    = Pi (16x^2 +16x + 4)(5x^2 - 4)

    without completing the whole expansion, I know it has to start with
    80Pi x^3 and end in -16Pi
    The only answer that matches that is C

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    posted by Reiny

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