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D( x )
4*x^2+4*x-120 = 0
4*x^2+4*x-120 = 0
4*x^2+4*x-120 = 0
4*x^2+4*x-120 = 0
DELTA = 4^2-(-120*4*4)
DELTA = 1936
DELTA > 0
x = (1936^(1/2)-4)/(2*4) or x = (-1936^(1/2)-4)/(2*4)
x = 5 or x = -6
x in (-oo:-6) U (-6:5) U (5:+oo)
(x^2-(4*x)-5)/(4*x^2+4*x-120) = 0
(x^2-4*x-5)/(4*x^2+4*x-120) = 0
x^2-4*x-5 = 0
x^2-4*x-5 = 0
DELTA = (-4)^2-(-5*1*4)
DELTA = 36
DELTA > 0
x = (36^(1/2)+4)/(1*2) or x = (4-36^(1/2))/(1*2)
x = 5 or x = -1
(x+1)*(x-5) = 0
4*x^2+4*x-120 = 0
4*(x^2+x-30) = 0
x^2+x-30 = 0
DELTA = 1^2-(-30*1*4)
DELTA = 121
DELTA > 0
x = (121^(1/2)-1)/(1*2) or x = (-121^(1/2)-1)/(1*2)
x = 5 or x = -6
4*(x+6)*(x-5) = 0
((x+1)*(x-5))/(4*(x+6)*(x-5)) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-5 )
x-5 = 0 // + 5
x = 5
x in { 5}
x = -1
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