Maths Help

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xD_aQt

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Re: Maths Help

« Reply #30 on: May 25, 2011, 10:20:02 pm »

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Find the volume obtained when the region above y = 0 and below y = 4-(x-2)² is revolved around the x-axis

is this question basically asking for the area? do we integrate then let y=0? help?

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jasoN-

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Re: Maths Help

« Reply #31 on: May 25, 2011, 10:26:11 pm »

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this is asking for the volume of revolution, which is in specialist maths.
but the formula is $V_y = \int_a^b \pi x^2 dy$

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xD_aQt

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Re: Maths Help

« Reply #32 on: May 25, 2011, 10:39:06 pm »

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Oh alright, never did spesh, cheers ...

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