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x^2+5x-216=0
a = 1; b = 5; c = -216;
Δ = b2-4ac
Δ = 52-4·1·(-216)
Δ = 889
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{-(5)-\sqrt{889}}{2*1}=\frac{-5-\sqrt{889}}{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+\sqrt{889}}{2*1}=\frac{-5+\sqrt{889}}{2} $
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