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D( x )
-3*x-75 = 0
-3*x-75 = 0
-3*x-75 = 0
-3*x-75 = 0 // + 75
-3*x = 75 // : -3
x = 75/(-3)
x = -25
x in (-oo:-25) U (-25:+oo)
((-x)^2-(50*x)-625)/(-3*x-75) = 0
((-x)^2-50*x-625)/(-3*x-75) = 0
(x^2-50*x-625)/(-3*x-75) = 0
x^2-50*x-625 = 0
x^2-50*x-625 = 0
DELTA = (-50)^2-(-625*1*4)
DELTA = 5000
DELTA > 0
x = (5000^(1/2)+50)/(1*2) or x = (50-5000^(1/2))/(1*2)
x = (50*2^(1/2)+50)/2 or x = (50-50*2^(1/2))/2
(x-((50-50*2^(1/2))/2))*(x-((50*2^(1/2)+50)/2)) = 0
((x-((50-50*2^(1/2))/2))*(x-((50*2^(1/2)+50)/2)))/(-3*x-75) = 0
( x-((50*2^(1/2)+50)/2) )
x-((50*2^(1/2)+50)/2) = 0 // + (50*2^(1/2)+50)/2
x = (50*2^(1/2)+50)/2
( x-((50-50*2^(1/2))/2) )
x-((50-50*2^(1/2))/2) = 0 // + (50-50*2^(1/2))/2
x = (50-50*2^(1/2))/2
x in { (50*2^(1/2)+50)/2, (50-50*2^(1/2))/2 }
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