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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
35*(700/x) = 15*450*x // - 15*450*x
35*(700/x)-(15*450*x) = 0
35*(700/x)-6750*x = 0
24500*x^-1-6750*x^1 = 0
(24500*x^0-6750*x^2)/(x^1) = 0 // * x^2
x^1*(24500*x^0-6750*x^2) = 0
x^1
24500-6750*x^2 = 0
24500-6750*x^2 = 0
DELTA = 0^2-(-6750*4*24500)
DELTA = 661500000
DELTA > 0
x = (661500000^(1/2)+0)/(-6750*2) or x = (0-661500000^(1/2))/(-6750*2)
x = (-7*6^(1/2))/9 or x = (7*6^(1/2))/9
x in { (-7*6^(1/2))/9, (7*6^(1/2))/9}
x in { (-7*6^(1/2))/9, (7*6^(1/2))/9 }
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