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(C)=0.7C^2+12000
We move all terms to the left:
(C)-(0.7C^2+12000)=0
We get rid of parentheses
-0.7C^2+C-12000=0
a = -0.7; b = 1; c = -12000;
Δ = b2-4ac
Δ = 12-4·(-0.7)·(-12000)
Δ = -33599
Delta is less than zero, so there is no solution for the equation
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