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5.5x^2+5x=11
We move all terms to the left:
5.5x^2+5x-(11)=0
a = 5.5; b = 5; c = -11;
Δ = b2-4ac
Δ = 52-4·5.5·(-11)
Δ = 267
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(5)-\sqrt{267}}{2*5.5}=\frac{-5-\sqrt{267}}{11} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+\sqrt{267}}{2*5.5}=\frac{-5+\sqrt{267}}{11} $
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