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6-2/x+x=-1
We move all terms to the left:
6-2/x+x-(-1)=0
Domain of the equation: x!=0We add all the numbers together, and all the variables
x∈R
x-2/x+7=0
We multiply all the terms by the denominator
x*x+7*x-2=0
We add all the numbers together, and all the variables
7x+x*x-2=0
Wy multiply elements
x^2+7x-2=0
a = 1; b = 7; c = -2;
Δ = b2-4ac
Δ = 72-4·1·(-2)
Δ = 57
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(7)-\sqrt{57}}{2*1}=\frac{-7-\sqrt{57}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(7)+\sqrt{57}}{2*1}=\frac{-7+\sqrt{57}}{2} $
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