4-1/r=9

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Solution for 4-1/r=9 equation: 


D( r )

r = 0

r = 0

r = 0

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

4-(1/r) = 9 // - 9

4-(1/r)-9 = 0

4-r^-1-9 = 0

-1*r^-1 = 5 // : -1

r^-1 = -5

-1 < 0

1/(r^1) = -5 // * r^1

1 = -5*r^1 // : -5

-1/5 = r^1

r = -1/5

r = -1/5

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