X(10-x)=75

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Solution for X(10-x)=75 equation: 



X(10-X)=75

We move all terms to the left:

X(10-X)-(75)=0

We add all the numbers together, and all the variables

X(-1X+10)-75=0

We multiply parentheses

-1X^2+10X-75=0

a = -1; b = 10; c = -75;
Δ = b2-4ac
Δ = 102-4·(-1)·(-75)
Δ = -200
Delta is less than zero, so there is no solution for the equation

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