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2g^2+13g+20=0
a = 2; b = 13; c = +20;
Δ = b2-4ac
Δ = 132-4·2·20
Δ = 9
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$g_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$g_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{9}=3$$g_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(13)-3}{2*2}=\frac{-16}{4} =-4 $$g_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(13)+3}{2*2}=\frac{-10}{4} =-2+1/2 $
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