anonymous
  • anonymous
h(t)=-15t^2+105t+10,0
Algebra
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
can someone help me please
cwrw238
  • cwrw238
190 =-15t^2+105t+10 rearranging 15t^2 - 105t + 180 = 0 you need to solve this equation for t
anonymous
  • anonymous
how do I do that

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cwrw238
  • cwrw238
ok first take out the common factor 15 to simplify the problem: 15(t^2 -7t + 12) = 0 now we have to solve the trinomial in the parentheses we need 2 numbers whose product id +12 and whose sum is -7 these are -4 and -3 so it factors to ( t - 4)(t - 3) = 0 ginig t = 3 and t = 4 so your required times are 3 seconds and 4 seconds
anonymous
  • anonymous
so the tshirt will reach the fan at 3 seconds
cwrw238
  • cwrw238
yea and again at 4 seconds
cwrw238
  • cwrw238
unless it gets sucked into the fan in 3 seconds!
cwrw238
  • cwrw238
if so its just as well its a tshirt

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