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D( x )
4*x^2-(9*x)-9 = 0
4*x^2-(9*x)-9 = 0
4*x^2-(9*x)-9 = 0
4*x^2-9*x-9 = 0
4*x^2-9*x-9 = 0
DELTA = (-9)^2-(-9*4*4)
DELTA = 225
DELTA > 0
x = (225^(1/2)+9)/(2*4) or x = (9-225^(1/2))/(2*4)
x = 3 or x = -3/4
x in (-oo:-3/4) U (-3/4:3) U (3:+oo)
(4*x^2-(1*x)-3)/(4*x^2-(9*x)-9) = 0
(4*x^2-x-3)/(4*x^2-9*x-9) = 0
4*x^2-x-3 = 0
4*x^2-x-3 = 0
DELTA = (-1)^2-(-3*4*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+1)/(2*4) or x = (1-49^(1/2))/(2*4)
x = 1 or x = -3/4
(x+3/4)*(x-1) = 0
4*x^2-9*x-9 = 0
4*x^2-9*x-9 = 0
DELTA = (-9)^2-(-9*4*4)
DELTA = 225
DELTA > 0
x = (225^(1/2)+9)/(2*4) or x = (9-225^(1/2))/(2*4)
x = 3 or x = -3/4
(x+3/4)*(x-3) = 0
((x+3/4)*(x-1))/((x+3/4)*(x-3)) = 0
( x+3/4 )
x+3/4 = 0 // - 3/4
x = -3/4
( x-1 )
x-1 = 0 // + 1
x = 1
x in { -3/4}
x = 1
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