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Determine the factor of a polynomial equation including piecewise functions

  1. Mar 5, 2012 #1
    The height,h, in meters, of a weather balloon above the ground after t seconds can be modelled by the function h(t)=-2t^3 + 3t^2 +149t + 410 for 0< t < 10. When is the balloon exactly 980m above the ground?

    980 = -2t3 + 3t2 +149t + 410
    0 = -2t3 + 3t2 +149t - 570
     
  2. jcsd
  3. Mar 5, 2012 #2

    tiny-tim

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    hi euro94! :smile:

    in exam questions like this, it's almost always a whole number,

    so try 1, 2, 3 ,4 ,5 ,… :wink:
     
  4. Mar 5, 2012 #3
    Thanks :)
    Can you please help me with this question :)

    Maria designed a rectangular storage unit with dimensions 1m by 2m by 4m. By what shoulds he increase each dimension to produce an actual storage that is 9 times the volume of his scale model?

    v= (1) (2) (4)
    v= 8

    v has to be 9 times larger
    v= (x+1) (x+2) (x+4)

    How do i find the value of x?
     
  5. Mar 5, 2012 #4

    tiny-tim

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    erm :redface:

    same method? :biggrin:

    (and i'm off to bed :zzz:)
     
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