t=420/x+(x-40)

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Solution for t=420/x+(x-40) equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

t = x+420/x-40 // - x+420/x-40

t-x-(420/x)+40 = 0

t-x-420*x^-1+40 = 0

40*x^0-1*x^1-420*x^-1 = 0

(40*x^1-1*x^2-420*x^0)/(x^1) = 0 // * x^2

x^1*(40*x^1-1*x^2-420*x^0) = 0

x^1

40*x-x^2-420 = 0

40*x-x^2-420 = 0

DELTA = 40^2-(-420*(-1)*4)

DELTA = -80

DELTA < 0

x in { } 

x belongs to the empty set

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