700/35r^2+63r

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Solution for 700/35r^2+63r equation: 


r in (-oo:+oo)

(700/35)*r^2+63*r = 0

20*r^2+63*r = 0

DELTA = 63^2-(0*4*20)

DELTA = 3969

DELTA > 0

r = (3969^(1/2)-63)/(2*20) or r = (-3969^(1/2)-63)/(2*20)

r = 0 or r = -63/20

r in { -63/20, 0 }

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