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2w^2+8w-120=0
a = 2; b = 8; c = -120;
Δ = b2-4ac
Δ = 82-4·2·(-120)
Δ = 1024
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$w_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$w_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{1024}=32$$w_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(8)-32}{2*2}=\frac{-40}{4} =-10 $$w_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(8)+32}{2*2}=\frac{24}{4} =6 $
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