R=2000*100-5x*x/100

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Solution for R=2000*100-5x*x/100 equation: 


x in (-oo:+oo)

R = 100*2000-((5*x*x)/100) // - 100*2000-((5*x*x)/100)

R+(5*x*x)/100-(100*2000) = 0

R+(5*x*x)/100-200000 = 0

1/20*x^2 = -(R-200000) // : 1/20

x^2 = 20*(200000-R)

x^2 = 20*(200000-R) // ^ 1/2

abs(x) = 2*5^(1/2)*(200000-R)^(1/2)

x = 2*5^(1/2)*(200000-R)^(1/2) or x = -(2*5^(1/2)*(200000-R)^(1/2))

x in { 2*5^(1/2)*(200000-R)^(1/2), -(2*5^(1/2)*(200000-R)^(1/2)) }

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