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2x^2+13x-36=0
a = 2; b = 13; c = -36;
Δ = b2-4ac
Δ = 132-4·2·(-36)
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{-(13)-\sqrt{457}}{2*2}=\frac{-13-\sqrt{457}}{4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(13)+\sqrt{457}}{2*2}=\frac{-13+\sqrt{457}}{4} $
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