r^2/20+8=15

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Solution for r^2/20+8=15 equation: 


r in (-oo:+oo)

(r^2)/20+8 = 15 // - 15

(r^2)/20-15+8 = 0

1/20*r^2 = 7 // : 1/20

r^2 = 140

r^2 = 140 // ^ 1/2

abs(r) = 2*35^(1/2)

r = 2*35^(1/2) or r = -(2*35^(1/2))

r in { 2*35^(1/2), -(2*35^(1/2)) }

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