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