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D( x )
10*x^2+26*x-12 = 0
10*x^2+26*x-12 = 0
10*x^2+26*x-12 = 0
10*x^2+26*x-12 = 0
DELTA = 26^2-(-12*4*10)
DELTA = 1156
DELTA > 0
x = (1156^(1/2)-26)/(2*10) or x = (-1156^(1/2)-26)/(2*10)
x = 2/5 or x = -3
x in (-oo:-3) U (-3:2/5) U (2/5:+oo)
(25*x^2+10*x-8)/(10*x^2+26*x-12) = 0
25*x^2+10*x-8 = 0
25*x^2+10*x-8 = 0
DELTA = 10^2-(-8*4*25)
DELTA = 900
DELTA > 0
x = (900^(1/2)-10)/(2*25) or x = (-900^(1/2)-10)/(2*25)
x = 2/5 or x = -4/5
(x+4/5)*(x-2/5) = 0
10*x^2+26*x-12 = 0
2*(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 = (-289^(1/2)-13)/(2*5)
x = 2/5 or x = -3
2*(x+3)*(x-2/5) = 0
((x+4/5)*(x-2/5))/(2*(x+3)*(x-2/5)) = 0
( x+4/5 )
x+4/5 = 0 // - 4/5
x = -4/5
( x-2/5 )
x-2/5 = 0 // + 2/5
x = 2/5
x in { 2/5}
x = -4/5
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