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2x^2+4x-448=0
a = 2; b = 4; c = -448;
Δ = b2-4ac
Δ = 42-4·2·(-448)
Δ = 3600
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{3600}=60$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(4)-60}{2*2}=\frac{-64}{4} =-16 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(4)+60}{2*2}=\frac{56}{4} =14 $
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