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D( x )
4*x-1 = 0
4*x-1 = 0
4*x-1 = 0
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
x in (-oo:1/4) U (1/4:+oo)
(((4*x-1)^2*(4*x^2-25))/(4*x-1))*(2*x^2-(3*x)-5) = 0
(((4*x-1)^2*(4*x^2-25))/(4*x-1))*(2*x^2-3*x-5) = 0
(4*x-1)*(4*x^2-25)*(2*x^2-3*x-5) = 0
2*x^2-3*x-5 = 0
2*x^2-3*x-5 = 0
DELTA = (-3)^2-(-5*2*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+3)/(2*2) or x = (3-49^(1/2))/(2*2)
x = 5/2 or x = -1
(x+1)*(x-5/2) = 0
(4*x-1)*(4*x^2-25)*(x+1)*(x-5/2) = 0
( 4*x-1 )
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
( 4*x^2-25 )
4*x^2 = 25 // : 4
x^2 = 25/4
x^2 = 25/4 // ^ 1/2
abs(x) = 5/2
x = 5/2 or x = -5/2
( x+1 )
x+1 = 0 // - 1
x = -1
( x-5/2 )
x-5/2 = 0 // + 5/2
x = 5/2
x in { 1/4}
x in { 5/2, -5/2, -1, 5/2 }
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