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Math Help - local max and min

  1. #1
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    local max and min

    what is the local max and min of 4x^5(8-x)^5
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  2. #2
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    Quote Originally Posted by jojoferni244 View Post
    what is the local max and min of 4x^5(8-x)^5
    Can you differentiate it? Can you solve f'(x) = 0?
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  3. #3
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    i got the derivitave to be 20x^4(8-x)^4 + 16x^5(8-x)^3
    then i got the zeroes to be 8 and 0. I said that the local max is 8 and zero is neither, but it said that it is wrong
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    Quote Originally Posted by jojoferni244 View Post
    i got the derivitave to be 20x^4(8-x)^4 + 16x^5(8-x)^3
    then i got the zeroes to be 8 and 0. I said that the local max is 8 and zero is neither, but it said that it is wrong
    Your derivative is very wrong. How did you get it? Please show all working.
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