sidneyfinch2002 sidneyfinch2002

07-06-2017
Mathematics

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

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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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