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X2-31X+200=0
We add all the numbers together, and all the variables
X^2-31X+200=0
a = 1; b = -31; c = +200;
Δ = b2-4ac
Δ = -312-4·1·200
Δ = 161
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{-(-31)-\sqrt{161}}{2*1}=\frac{31-\sqrt{161}}{2} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-31)+\sqrt{161}}{2*1}=\frac{31+\sqrt{161}}{2} $
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