100=4*(1/r^2)

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Solution for 100=4*(1/r^2) equation: 


D( r )

r^2 = 0

r^2 = 0

r^2 = 0

1*r^2 = 0 // : 1

r^2 = 0

r = 0

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

100 = 4*(1/(r^2)) // - 4*(1/(r^2))

100-(4*(1/(r^2))) = 0

100-4*r^-2 = 0

-4*r^-2 = -100 // : -4

r^-2 = 25

-2 < 0

1/(r^2) = 25 // * r^2

1 = 25*r^2 // : 25

1/25 = r^2

r^2 = 1/25 // ^ 1/2

abs(r) = 1/5

r = 1/5 or r = -1/5

r in { 1/5, -1/5 }

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