7=y-30/y

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Solution for 7=y-30/y equation: 


D( y )

y = 0

y = 0

y = 0

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

7 = y-(30/y) // - y-(30/y)

30/y-y+7 = 0

30*y^-1-1*y^1+7*y^0 = 0

(7*y^1-1*y^2+30*y^0)/(y^1) = 0 // * y^2

y^1*(7*y^1-1*y^2+30*y^0) = 0

y^1

7*y-y^2+30 = 0

7*y-y^2+30 = 0

DELTA = 7^2-(-1*4*30)

DELTA = 169

DELTA > 0

y = (169^(1/2)-7)/(-1*2) or y = (-169^(1/2)-7)/(-1*2)

y = -3 or y = 10

y in { -3, 10} 

y in { -3, 10 }

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