c-7/c+7

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Solution for c-7/c+7 equation: 


D( c )

c = 0

c = 0

c = 0

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

c-(7/c)+7 = 0

c-7*c^-1+7 = 0

1*c^1-7*c^-1+7*c^0 = 0

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

c^1*(1*c^2+7*c^1-7*c^0) = 0

c^1

c^2+7*c-7 = 0

c^2+7*c-7 = 0

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

DELTA = 77

DELTA > 0

c = (77^(1/2)-7)/(1*2) or c = (-77^(1/2)-7)/(1*2)

c = (77^(1/2)-7)/2 or c = (-(77^(1/2)+7))/2

c in { (-(77^(1/2)+7))/2, (77^(1/2)-7)/2} 

c in { (-(77^(1/2)+7))/2, (77^(1/2)-7)/2 }

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