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Math Help - Dealing with formulas

  1. #1
    Newbie Berengario's Avatar
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    Dealing with formulas

    Hi everyone. First of all, congratulations for the forum.
    I'm trying to grasp, as a complete beginner, some concepts of Math. I'm reading "Mathematics: its content methods and meaning"
    I have a doubt (it won't be the last )
    Mathematics: Its Content, Methods and Meaning - Aleksandr Danilovich Aleksandrov, Andréi Nikoláevich Kolmogórov, M. A. Lavrent'ev - Google Libros

    I hope the link works, if it doesn't I'll copy the example.
    I don't understand the step in page 67
    S2=g(t + At)2 / 2 = gt2/2 + g/2 (2tAt + At2)
    It's this part in bold that I don't know where it comes from.

    I hope the notation is legible and my English readable.
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  2. #2
    MHF Contributor
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    Re: Dealing with formulas

    Yay for Russian mathematics!

    Quote Originally Posted by Berengario View Post
    I don't understand the step in page 67
    S2=g(t + At)2 / 2 = gt2/2 + g/2 (2tAt + At2)
    It's this part in bold that I don't know where it comes from.
    This is because (t + Δt)² = t² + 2tΔt + (Δt)².
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  3. #3
    Newbie Berengario's Avatar
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    Madrid
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    Re: Dealing with formulas

    Right... So I'm missing also some essential Physics...

    Thank you very much!
    Большое спасибо!

    It's a great book... I'll try to go as far as possible.
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