calc help

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the position function of a particle is given by
s=t^3–4t^2–7t t>=0

where s is measured in meters and t in seconds. When does the particle reach a velocity of 10 m/s?

  • calc help -

    Take the derivative:

    v=3t^2 -8t -7

    put v=10 and rearrange it to have a quadratic in standard format, solve the quadratic with the quadratic formula.

  • calc help -

    i got 1.39 and -4.06 but i still got it wrong

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