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-2x^2-3x+56=0
a = -2; b = -3; c = +56;
Δ = b2-4ac
Δ = -32-4·(-2)·56
Δ = 457
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{457}}{2*-2}=\frac{3-\sqrt{457}}{-4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+\sqrt{457}}{2*-2}=\frac{3+\sqrt{457}}{-4} $
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