1.98=(8.99*10^9)*(11.7*10^-6)*(29.9*10^-6)/r^2

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Solution for 1.98=(8.99*10^9)*(11.7*10^-6)*(29.9*10^-6)/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)

1.98 = (8.99*11.7*29.9*10^9*10^-6*10^-6)/(r^2) // - (8.99*11.7*29.9*10^9*10^-6*10^-6)/(r^2)

1.98-((8.99*11.7*29.9*10^9*10^-6*10^-6)/(r^2)) = 0

1.98-3144.9717*10^-3*r^-2 = 0

-3.1449717*r^-2 = -1.98 // : -3.1449717

r^-2 = 0.62957641

-2 < 0

1/(r^2) = 0.62957641 // * r^2

1 = 0.62957641*r^2 // : 0.62957641

1.58836955 = r^2

r^2 = 1.58836955 // ^ 1/2

abs(r) = 1.58836955^(1/2)

r = 1.58836955^(1/2) or r = -1.58836955^(1/2)

r in { 1.58836955^(1/2), -1.58836955^(1/2) }

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