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I was attempting a volume integral question out of a book. I know what the final answer is and what integral i am supposed to work out but I do not know how I am supposed to solve it. I have tried different ways such as integration by substitution and integration by parts but I do not seem to be getting anywhere.

This is the ∫[itex]^{1}_{-1}[/itex] 4(√(1-x[itex]^{2}[/itex]))(x+1)dx The answer is 2pi.

any help would be great thanks.

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# Volume integral question

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