0=16-15y-(1/y)

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Solution for 0=16-15y-(1/y) equation: 


D( y )

y = 0

y = 0

y = 0

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

0 = 16-(15*y)-(1/y) // - 16-(15*y)-(1/y)

15*y+1/y-16+0 = 0

15*y+1/y-16 = 0

15*y^1+1*y^-1-16*y^0 = 0

(15*y^2-16*y^1+1*y^0)/(y^1) = 0 // * y^2

y^1*(15*y^2-16*y^1+1*y^0) = 0

y^1

15*y^2-16*y+1 = 0

15*y^2-16*y+1 = 0

DELTA = (-16)^2-(1*4*15)

DELTA = 196

DELTA > 0

y = (196^(1/2)+16)/(2*15) or y = (16-196^(1/2))/(2*15)

y = 1 or y = 1/15

y in { 1/15, 1} 

y in { 1/15, 1 }

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