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2r^2+6r-176=0
a = 2; b = 6; c = -176;
Δ = b2-4ac
Δ = 62-4·2·(-176)
Δ = 1444
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{1444}=38$$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6)-38}{2*2}=\frac{-44}{4} =-11 $$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6)+38}{2*2}=\frac{32}{4} =8 $
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