x(28-x)=200

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Solution for x(28-x)=200 equation: 



x(28-x)=200

We move all terms to the left:

x(28-x)-(200)=0

We add all the numbers together, and all the variables

x(-1x+28)-200=0

We multiply parentheses

-1x^2+28x-200=0

a = -1; b = 28; c = -200;
Δ = b2-4ac
Δ = 282-4·(-1)·(-200)
Δ = -16
Delta is less than zero, so there is no solution for the equation

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