C=1000+3x+0.004x^2

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Solution for C=1000+3x+0.004x^2 equation: 



=1000+3C+0.004C^2

We move all terms to the left:

-(1000+3C+0.004C^2)=0

We get rid of parentheses

-0.004C^2-3C-1000=0

a = -0.004; b = -3; c = -1000;
Δ = b2-4ac
Δ = -32-4·(-0.004)·(-1000)
Δ = -7
Delta is less than zero, so there is no solution for the equation

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