x(10-x)=40,

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Solution for x(10-x)=40, equation: 



x(10-x)=40.

We move all terms to the left:

x(10-x)-(40.)=0

We add all the numbers together, and all the variables

x(-1x+10)-40=0

We multiply parentheses

-1x^2+10x-40=0

a = -1; b = 10; c = -40;
Δ = b2-4ac
Δ = 102-4·(-1)·(-40)
Δ = -60
Delta is less than zero, so there is no solution for the equation

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