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x^2+x=106.67
We move all terms to the left:
x^2+x-(106.67)=0
We add all the numbers together, and all the variables
x^2+x-106.67=0
a = 1; b = 1; c = -106.67;
Δ = b2-4ac
Δ = 12-4·1·(-106.67)
Δ = 427.68
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{-(1)-\sqrt{427.68}}{2*1}=\frac{-1-\sqrt{427.68}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+\sqrt{427.68}}{2*1}=\frac{-1+\sqrt{427.68}}{2} $
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