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D( x )
5*x^2-(13*x)-6 = 0
5*x^2-(13*x)-6 = 0
5*x^2-(13*x)-6 = 0
5*x^2-13*x-6 = 0
5*x^2-13*x-6 = 0
DELTA = (-13)^2-(-6*4*5)
DELTA = 289
DELTA > 0
x = (289^(1/2)+13)/(2*5) or x = (13-289^(1/2))/(2*5)
x = 3 or x = -2/5
x in (-oo:-2/5) U (-2/5:3) U (3:+oo)
(5*x^2-(11*x)-12)/(5*x^2-(13*x)-6) = 0
(5*x^2-11*x-12)/(5*x^2-13*x-6) = 0
5*x^2-11*x-12 = 0
5*x^2-11*x-12 = 0
DELTA = (-11)^2-(-12*4*5)
DELTA = 361
DELTA > 0
x = (361^(1/2)+11)/(2*5) or x = (11-361^(1/2))/(2*5)
x = 3 or x = -4/5
(x+4/5)*(x-3) = 0
5*x^2-13*x-6 = 0
5*x^2-13*x-6 = 0
DELTA = (-13)^2-(-6*4*5)
DELTA = 289
DELTA > 0
x = (289^(1/2)+13)/(2*5) or x = (13-289^(1/2))/(2*5)
x = 3 or x = -2/5
(x+2/5)*(x-3) = 0
((x+4/5)*(x-3))/((x+2/5)*(x-3)) = 0
( x+4/5 )
x+4/5 = 0 // - 4/5
x = -4/5
( x-3 )
x-3 = 0 // + 3
x = 3
x in { 3}
x = -4/5
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