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-3x^2-15x+4=0
a = -3; b = -15; c = +4;
Δ = b2-4ac
Δ = -152-4·(-3)·4
Δ = 273
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{-(-15)-\sqrt{273}}{2*-3}=\frac{15-\sqrt{273}}{-6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-15)+\sqrt{273}}{2*-3}=\frac{15+\sqrt{273}}{-6} $
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