Inverse of a Natural Log! Requires Calculus Knowledge!?

Find the inverse of h(x) = Ln (4-19x)

h^ -1 (x)= ???

Please Explain If you Can Thanks!

Comments

  • h^-1 (x) is y if h(y)=x

    So we need to write x=h(y)=ln(4-19y).

    Knowing x we want to solve for y (i.e., find y)

    ln(4-19y)=x means 4-19y=e^x, where e is the usual constant 2.718282 (approx)

    Subtract 4 from both sides

    -19y=e^x-4

    Divide by -19 on both sides

    y= (e^x-4)/(-19)=(4-e^x)/19

    Thus h^-1(x)=(4-e^x)/19

    Hope this helps.

  • step one is to solve for x in terms of y. This involves manipulating ln(x)=e^x

    y=ln(4-19x)=ln(4)/ln(-19x)=e^4/e^-19x

    so e^-19x/e^4/y=1/y which implies that y=e^19x-4, now take the natural log of both sides

    ln(y) = 19x-4 so x=(ln(y)+4)/19

    step 2 is to change the y to x,so the inverse function is y=(ln(x)+4)/19

  • Let h(x) = y, then h^(-1)(y) = x

    So, ln(4 - 19x) = y

    4 - 19x = e^y

    19x = 4 - e^y

    x = (1/19)(4 - e^y)

    Thus, h^(-1)(y) = (1/19)(4 - e^y), so h^(-1)(x) = (1/19)(4 - e^x)

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