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First Derivative? 1st physics calculus class-help

  1. Jan 15, 2004 #1
    the position of a particle on the x-axis is given:
    x = 7.8 + 9.2t -2.1t^3

    what is the velocity at t = 3.5 s ?

    so i need to find the derivative of d/dt (7.8 + 9.2t -2.1t^3)

    i'm completely lost on how to find it. thanks.
  2. jcsd
  3. Jan 15, 2004 #2
    Look up at the formula its simple plug in pro

  4. Jan 16, 2004 #3
    Thanks. That was really easy now that I see the correct formula. Differentiation by exponent.
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