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x^2-21x-882=0
a = 1; b = -21; c = -882;
Δ = b2-4ac
Δ = -212-4·1·(-882)
Δ = 3969
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{3969}=63$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-21)-63}{2*1}=\frac{-42}{2} =-21 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-21)+63}{2*1}=\frac{84}{2} =42 $
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