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March 29, 2017

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d/dx[lnsquare root of(x^3) cube root of (x+3) fifth root of (3x-2)]

  • Calculus - ,

    are we taking ln of the whole thing??

    I read it as
    d( ln [ (x^3)^(1/2) (x+3)^(1/3) (3x-2)^(1/5) ] /dx

    let y = ln [ (x^3)^(1/2) (x+3)^(1/3) (3x-2)^(1/5) ]
    remember ln(AB) = lnA + lnB
    so our
    y = ln (x^3)^(1/2) + ln (x+3)^(1/3) + ln (3x-2)^(1/5)
    and remember ln A^n = n lnA

    = 3(1/2) lnx + (1/3)ln(x+3) + (1/5)ln(3x-2)

    dy/dx = (3/2)(1/x) + (1/3)(1/(x+3) + 1/5)(3/(3x-2))
    = 3/(2x) + 1/(3(x+3)) + 3/(5(3x-2))

    I would not take it any further, it would look even messier, having to form a common denominator of
    30(x+3)(3x-2)

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