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Math Help - Linear approximation!

  1. #1
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    Linear approximation!

    The linear approximation at x = 0 to f(x) = sqrt (7 + 7 x) is y =


    any help will be appreciated!!
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  2. #2
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    Quote Originally Posted by frozenflames View Post
    The linear approximation at x = 0 to f(x) = sqrt (7 + 7 x) is y =


    any help will be appreciated!!
    see your other post ...

    http://www.mathhelpforum.com/math-he...gent-line.html
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    Quote Originally Posted by skeeter View Post


    i use the same approach and get the following: .1889822x+2.64575

    but it is incorrect. any thoughts?
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  4. #4
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    Quote Originally Posted by frozenflames View Post
    i use the same approach and get the following: .1889822x+2.64575

    but it is incorrect. any thoughts?
    first of all, put away the calculator.

    your slope is wrong

    what did you get for f'(x) ?
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  5. #5
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    Quote Originally Posted by skeeter View Post
    first of all, put away the calculator.

    your slope is wrong

    what did you get for f'(x) ?


    I get 1/(2*sqrt (7+7x)
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  6. #6
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    Quote Originally Posted by frozenflames View Post
    I get 1/(2*sqrt (7+7x)
    you forgot the chain rule ... bad juju!
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  7. #7
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    ofcourse!! i'm forgetting the inner and multiply by 7
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