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D( x )
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
(4*x^2+16*x-21)/(2*x-1) = 0
4*x^2+16*x-21 = 0
4*x^2+16*x-21 = 0
DELTA = 16^2-(-21*4*4)
DELTA = 592
DELTA > 0
x = (592^(1/2)-16)/(2*4) or x = (-592^(1/2)-16)/(2*4)
x = (4*37^(1/2)-16)/8 or x = (-4*37^(1/2)-16)/8
(x-((-4*37^(1/2)-16)/8))*(x-((4*37^(1/2)-16)/8)) = 0
((x-((-4*37^(1/2)-16)/8))*(x-((4*37^(1/2)-16)/8)))/(2*x-1) = 0
( x-((-4*37^(1/2)-16)/8) )
x-((-4*37^(1/2)-16)/8) = 0 // + (-4*37^(1/2)-16)/8
x = (-4*37^(1/2)-16)/8
( x-((4*37^(1/2)-16)/8) )
x-((4*37^(1/2)-16)/8) = 0 // + (4*37^(1/2)-16)/8
x = (4*37^(1/2)-16)/8
x in { (-4*37^(1/2)-16)/8, (4*37^(1/2)-16)/8 }
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