C(x)=3x2-18x+72.

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Solution for C(x)=3x2-18x+72. equation: 



(C)=3C^2-18C+72.

We move all terms to the left:

(C)-(3C^2-18C+72.)=0

We get rid of parentheses

-3C^2+C+18C-72.=0

We add all the numbers together, and all the variables

-3C^2+19C-72=0

a = -3; b = 19; c = -72;
Δ = b2-4ac
Δ = 192-4·(-3)·(-72)
Δ = -503
Delta is less than zero, so there is no solution for the equation

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