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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
180 = X+7/X // - X+7/X
180-X-(7/X) = 0
180-X-7*X^-1 = 0
180*X^0-1*X^1-7*X^-1 = 0
(180*X^1-1*X^2-7*X^0)/(X^1) = 0 // * X^2
X^1*(180*X^1-1*X^2-7*X^0) = 0
X^1
180*X-X^2-7 = 0
180*X-X^2-7 = 0
DELTA = 180^2-(-7*(-1)*4)
DELTA = 32372
DELTA > 0
X = (32372^(1/2)-180)/(-1*2) or X = (-32372^(1/2)-180)/(-1*2)
X = (2*8093^(1/2)-180)/(-2) or X = (-2*8093^(1/2)-180)/(-2)
X in { (2*8093^(1/2)-180)/(-2), (-2*8093^(1/2)-180)/(-2)}
X in { (2*8093^(1/2)-180)/(-2), (-2*8093^(1/2)-180)/(-2) }
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