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D( x )
4*x^2-(12*x)-160 = 0
4*x^2-(12*x)-160 = 0
4*x^2-(12*x)-160 = 0
4*x^2-12*x-160 = 0
4*x^2-12*x-160 = 0
DELTA = (-12)^2-(-160*4*4)
DELTA = 2704
DELTA > 0
x = (2704^(1/2)+12)/(2*4) or x = (12-2704^(1/2))/(2*4)
x = 8 or x = -5
x in (-oo:-5) U (-5:8) U (8:+oo)
(2*x-71)/(4*x^2-(12*x)-160) = 0
(2*x-71)/(4*x^2-12*x-160) = 0
4*x^2-12*x-160 = 0
4*(x^2-3*x-40) = 0
x^2-3*x-40 = 0
DELTA = (-3)^2-(-40*1*4)
DELTA = 169
DELTA > 0
x = (169^(1/2)+3)/(1*2) or x = (3-169^(1/2))/(1*2)
x = 8 or x = -5
4*(x+5)*(x-8) = 0
(2*x-71)/(4*(x+5)*(x-8)) = 0
2*x-71 = 0 // + 71
2*x = 71 // : 2
x = 71/2
x = 71/2
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