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D( x )
5-x < 0
5-x < 0
5-x < 0
5-x < 0
-x < -5 // * -1
x > 5
x in (-oo:5>
(5-x)^(1/2)-(2*x) = 0
(5-x)^(1/2)-2*x = 0
(5-x)^(1/2) = -2*x // + -2*x
(5-x)^(1/2) = -(-2*x) // ^ 2
abs(5-x) = (-(-2*x))^2 // - (-(-2*x))^2
abs(5-x)-(-(-2*x))^2 = 0
x in (-oo:+oo)
abs(5-x)
5-x >= 0
5-x >= 0
-x >= -5 // * -1
x <= 5
x in (-oo:5>
5-(-(-2*x))^2-x = 0
x in (5:+oo)
x-(-(-2*x))^2-5 = 0
abs(5-x)-(-(-2*x))^2 = 0
/ | 5-(-(-2*x))^2-x = 0 i x in (-oo:5> | x-(-(-2*x))^2-5 = 0 i x in (5:+oo)
x in (-oo:5>
5-(-(-2*x))^2-x = 0
5-4*x^2-x = 0
DELTA = (-1)^2-(-4*4*5)
DELTA = 81
DELTA > 0
x = (81^(1/2)+1)/(-4*2) or x = (1-81^(1/2))/(-4*2)
x = -5/4 or x = 1
x in (5:+oo)
x-(-(-2*x))^2-5 = 0
x-4*x^2-5 = 0
DELTA = 1^2-(-5*(-4)*4)
DELTA = -79
DELTA < 0
x in { -5/4, 1 }
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