(d+2/4d-1)-(7/d+5)

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Solution for (d+2/4d-1)-(7/d+5) equation: 


D( d )

d = 0

d = 0

d = 0

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

d+(2/4)*d-(7/d)-5-1 = 0

d+(2/4)*d-7*d^-1-5-1 = 0

3/2*d^1-7*d^-1-6*d^0 = 0

(3/2*d^2-6*d^1-7*d^0)/(d^1) = 0 // * d^2

d^1*(3/2*d^2-6*d^1-7*d^0) = 0

d^1

(3/2)*d^2-6*d-7 = 0

(3/2)*d^2-6*d-7 = 0

DELTA = (-6)^2-(-7*4*(3/2))

DELTA = 78

DELTA > 0

d = (78^(1/2)+6)/(2*(3/2)) or d = (6-78^(1/2))/(2*(3/2))

d = (78^(1/2)+6)/3 or d = (6-78^(1/2))/3

d in { (6-78^(1/2))/3, (78^(1/2)+6)/3} 

d in { (6-78^(1/2))/3, (78^(1/2)+6)/3 }

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