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3X^2-3X-11=0
a = 3; b = -3; c = -11;
Δ = b2-4ac
Δ = -32-4·3·(-11)
Δ = 141
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{141}}{2*3}=\frac{3-\sqrt{141}}{6} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+\sqrt{141}}{2*3}=\frac{3+\sqrt{141}}{6} $
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