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D( x )
2.5-x = 0
2.5-x = 0
2.5-x = 0
2.5-x = 0 // - 2.5
-x = -2.5 // * -1
x = 2.5
x in (-oo:2.5) U (2.5:+oo)
3.7 = (4*x^2)/(2.5-x) // - (4*x^2)/(2.5-x)
3.7-((4*x^2)/(2.5-x)) = 0
3.7-4*x^2*(2.5-x)^-1 = 0
(-4*x^2)/(2.5-x)+3.7 = 0
(-4*x^2)/(2.5-x)+(3.7*(2.5-x))/(2.5-x) = 0
3.7*(2.5-x)-4*x^2 = 0
9.25-4*x^2-3.7*x = 0
9.25-4*x^2-3.7*x = 0
9.25-4*x^2-3.7*x = 0
DELTA = (-3.7)^2-(-4*4*9.25)
DELTA = 3.7^2+148
DELTA = 161.69
DELTA > 0
x = ((3.7^2+148)^(1/2)+3.7)/(-4*2) or x = (3.7-(3.7^2+148)^(1/2))/(-4*2)
x = ((3.7^2+148)^(1/2)+3.7)/(-8) or x = (3.7-(3.7^2+148)^(1/2))/(-8)
(x-(((3.7^2+148)^(1/2)+3.7)/(-8)))*(x-((3.7-(3.7^2+148)^(1/2))/(-8))) = 0
((x-(((3.7^2+148)^(1/2)+3.7)/(-8)))*(x-((3.7-(3.7^2+148)^(1/2))/(-8))))/(2.5-x) = 0
((x-(((3.7^2+148)^(1/2)+3.7)/(-8)))*(x-((3.7-(3.7^2+148)^(1/2))/(-8))))/(2.5-x) = 0 // * 2.5-x
(x-(((3.7^2+148)^(1/2)+3.7)/(-8)))*(x-((3.7-(3.7^2+148)^(1/2))/(-8))) = 0
( x-(((3.7^2+148)^(1/2)+3.7)/(-8)) )
x-(((3.7^2+148)^(1/2)+3.7)/(-8)) = 0 // + ((3.7^2+148)^(1/2)+3.7)/(-8)
x = ((3.7^2+148)^(1/2)+3.7)/(-8)
( x-((3.7-(3.7^2+148)^(1/2))/(-8)) )
x-((3.7-(3.7^2+148)^(1/2))/(-8)) = 0 // + (3.7-(3.7^2+148)^(1/2))/(-8)
x = (3.7-(3.7^2+148)^(1/2))/(-8)
x in { ((3.7^2+148)^(1/2)+3.7)/(-8), (3.7-(3.7^2+148)^(1/2))/(-8) }
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