3x-x^2=400

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Solution for 3x-x^2=400 equation: 



3x-x^2=400

We move all terms to the left:

3x-x^2-(400)=0

We add all the numbers together, and all the variables

-1x^2+3x-400=0

a = -1; b = 3; c = -400;
Δ = b2-4ac
Δ = 32-4·(-1)·(-400)
Δ = -1591
Delta is less than zero, so there is no solution for the equation

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