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March 28, 2017

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Find the slope and the equation of the tangent line to the graph of the function f at the specified point.

f(x)=-10/3x^2+6x+6; (-1, -10/3)

slope ??

tangent line y = ?

  • math - ,

    already answered by bobpursley

  • math - ,

    he was wrong

  • math - ,

    Kimberly, as I pointed out to you in another post, it is very important to use brackets in this format to establish the correct order of operation, since we cannot "build" fractions here.
    bobpursley interpreted your equation as
    f(x) = 10/(3x^2 + 6 x + 6)
    and his answer is correct according to that equation

    the way you typed it ....
    f'(x) = (-20/3)x + 6
    f'(-1) = 20/3 + 6 =38/3

    so the slope is 38/3

    equation:

    y + 10/3 = (38/3)(x+1)
    times 3
    3y + 10 = 38(x+1)
    3y = 38x + 38 - 10
    3y = 38x + 28
    y = (38/3)x + 28/3

    or
    38x - 3y = -28

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