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Math Help - differential help.

  1. #1
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    differential help.

    Hello,

    Hopefully someone can help me...


    Let .
    Find the differential when and
    Find the differential when and

    this is a new concept for me, any help is greatly appreciated. Thanks!
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by xcelxp View Post
    Hello,

    Hopefully someone can help me...


    Let .
    Find the differential when and
    Find the differential when and

    this is a new concept for me, any help is greatly appreciated. Thanks!
    Let's differntiate:

    y = 2x^2 + 2x + 4
    => dy/dx = 4x + 2
    => dy = dx(4x + 2)...........multiplied both sides by dx

    when x = 1 and dx = 0.3
    => dy = 0.3(4(1) + 2)
    => dy = 1.8

    when x = 1 and dx = 0.6
    => dy = 0.6(4(1) + 2)
    => dy = 3.6

    the trick is that dy/dx is more than just a notation, we can treat it like a fraction and split it up, so we are able to solve for one piece of it
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  3. #3
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    Thanks!
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