d+1/d-6*d-1/9d+9

Solution for d+1/d-6*d-1/9d+9 equation:

D( d )

d = 0

d = 0

d = 0

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

d-(6*d)-((1/9)*d)+1/d+9 = 0

d-6*d+(-1/9)*d+1/d+9 = 0

1*d^-1-46/9*d^1+9*d^0 = 0

(9*d^1-46/9*d^2+1*d^0)/(d^1) = 0 // * d^2

d^1*(9*d^1-46/9*d^2+1*d^0) = 0

d^1

(-46/9)*d^2+9*d+1 = 0

(-46/9)*d^2+9*d+1 = 0

DELTA = 9^2-(1*4*(-46/9))

DELTA = 913/9

DELTA > 0

d = ((913/9)^(1/2)-9)/(2*(-46/9)) or d = (-(913/9)^(1/2)-9)/(2*(-46/9))

d = -9/92*((913/9)^(1/2)-9) or d = 9/92*((913/9)^(1/2)+9)

d in { -9/92*((913/9)^(1/2)-9), 9/92*((913/9)^(1/2)+9)} 

d in { -9/92*((913/9)^(1/2)-9), 9/92*((913/9)^(1/2)+9) }