sidneyfinch2002 sidneyfinch2002
  • 07-06-2017
  • Mathematics
contestada

what are the x-intercepts of the function f(x)=-2x^2-3x+20

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ghanami
ghanami ghanami
  • 07-06-2017
hello : 
f(x) = 0 
2x²-3x +20 =0
Δ = b²-4ac    a=2    b= -3   c = 20
Δ = (-3)²-4(2)(20) = 9+160=169 = 13²
x1 = (3-13)/4   or x2= (3+13)/4
the x-intercepts  are : -5/2  , 4
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