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D( x )
8*x-20 = 0
8*x-20 = 0
8*x-20 = 0
8*x-20 = 0 // + 20
8*x = 20 // : 8
x = 20/8
x = 5/2
x in (-oo:5/2) U (5/2:+oo)
1/(8*x-20) = (1/2)*(10*x-4) // - (1/2)*(10*x-4)
1/(8*x-20)-((1/2)*(10*x-4)) = 0
1/(8*x-20)+(-1/2)*(10*x-4) = 0
1/(8*x-20)-1/2*(10*x-4) = 0
1/(8*x-20)+(-1/2*(10*x-4)*(8*x-20))/(8*x-20) = 0
1-1/2*(10*x-4)*(8*x-20) = 0
116*x-40*x^2-39 = 0
116*x-40*x^2-39 = 0
116*x-40*x^2-39 = 0
DELTA = 116^2-(-40*(-39)*4)
DELTA = 7216
DELTA > 0
x = (7216^(1/2)-116)/(-40*2) or x = (-7216^(1/2)-116)/(-40*2)
x = (4*451^(1/2)-116)/(-80) or x = (-4*451^(1/2)-116)/(-80)
(x-((4*451^(1/2)-116)/(-80)))*(x-((-4*451^(1/2)-116)/(-80))) = 0
((x-((4*451^(1/2)-116)/(-80)))*(x-((-4*451^(1/2)-116)/(-80))))/(8*x-20) = 0
((x-((4*451^(1/2)-116)/(-80)))*(x-((-4*451^(1/2)-116)/(-80))))/(8*x-20) = 0 // * 8*x-20
(x-((4*451^(1/2)-116)/(-80)))*(x-((-4*451^(1/2)-116)/(-80))) = 0
( x-((-4*451^(1/2)-116)/(-80)) )
x-((-4*451^(1/2)-116)/(-80)) = 0 // + (-4*451^(1/2)-116)/(-80)
x = (-4*451^(1/2)-116)/(-80)
( x-((4*451^(1/2)-116)/(-80)) )
x-((4*451^(1/2)-116)/(-80)) = 0 // + (4*451^(1/2)-116)/(-80)
x = (4*451^(1/2)-116)/(-80)
x in { (-4*451^(1/2)-116)/(-80), (4*451^(1/2)-116)/(-80) }
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