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D( x )
8*x^2+26*x-7 = 0
8*x^2+26*x-7 = 0
8*x^2+26*x-7 = 0
8*x^2+26*x-7 = 0
DELTA = 26^2-(-7*4*8)
DELTA = 900
DELTA > 0
x = (900^(1/2)-26)/(2*8) or x = (-900^(1/2)-26)/(2*8)
x = 1/4 or x = -7/2
x in (-oo:-7/2) U (-7/2:1/4) U (1/4:+oo)
(4*x-1)/(8*x^2+26*x-7) = 0
8*x^2+26*x-7 = 0
8*x^2+26*x-7 = 0
DELTA = 26^2-(-7*4*8)
DELTA = 900
DELTA > 0
x = (900^(1/2)-26)/(2*8) or x = (-900^(1/2)-26)/(2*8)
x = 1/4 or x = -7/2
(x+7/2)*(x-1/4) = 0
(4*x-1)/((x+7/2)*(x-1/4)) = 0
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
x in { 1/4}
x belongs to the empty set
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