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(1/340)*x^2-(100*x)-340 = 0
(1/340)*x^2-100*x-340 = 0
1/340*x^2-100*x-340 = 0
DELTA = (-100)^2-(-340*1/340*4)
DELTA = 10004
DELTA > 0
x = (10004^(1/2)+100)/(1/340*2) or x = (100-10004^(1/2))/(1/340*2)
x = 170*(2*2501^(1/2)+100) or x = 170*(100-2*2501^(1/2))
x in { 170*(100-2*2501^(1/2)), 170*(2*2501^(1/2)+100) }
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