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3x^2-3x-13=0
a = 3; b = -3; c = -13;
Δ = b2-4ac
Δ = -32-4·3·(-13)
Δ = 165
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{-(-3)-\sqrt{165}}{2*3}=\frac{3-\sqrt{165}}{6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+\sqrt{165}}{2*3}=\frac{3+\sqrt{165}}{6} $
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