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6x^2+11x=55
We move all terms to the left:
6x^2+11x-(55)=0
a = 6; b = 11; c = -55;
Δ = b2-4ac
Δ = 112-4·6·(-55)
Δ = 1441
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{-(11)-\sqrt{1441}}{2*6}=\frac{-11-\sqrt{1441}}{12} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(11)+\sqrt{1441}}{2*6}=\frac{-11+\sqrt{1441}}{12} $
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