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zaynahf

  • 3 years ago

Quadratics word problem

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  1. zaynahf
    • 3 years ago
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    An arrow is shot upward from a platform 40 feet high with an initial velocity of 224 ft. per second. its height, h, in feet after t seconds is given by the equation: h= -16t^2 + 224t+40. At what times will the arrow be 824 feet above the ground?

  2. zaynahf
    • 3 years ago
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    Am i supposed to plug in 824 for t?

  3. anonymous
    • 3 years ago
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    no, \(t\) is the time you are looking for you are supposed to replace \(h\) by 824 and solve for \(t\)

  4. Azteck
    • 3 years ago
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    h is replaced by 824

  5. wio
    • 3 years ago
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    \[ \begin{array}{rcl} h(t) &=& -16t^2 + 224t+40 \\ 824 &=& -16t^2 + 224t+40 \\ 0 &=& -16t^2 + 224t+40-824 \end{array} \] Quadratic formula.

  6. zaynahf
    • 3 years ago
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    Ohh ok i see it now.. then you just factor, correct?

  7. wio
    • 3 years ago
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    Ummm, you're solving for \(t\) here. You can factor or use quadratic formula or whatever method you want.

  8. zaynahf
    • 3 years ago
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    I see.. thanks!

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