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6x^2-4x=86
We move all terms to the left:
6x^2-4x-(86)=0
a = 6; b = -4; c = -86;
Δ = b2-4ac
Δ = -42-4·6·(-86)
Δ = 2080
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{2080}=\sqrt{16*130}=\sqrt{16}*\sqrt{130}=4\sqrt{130}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-4)-4\sqrt{130}}{2*6}=\frac{4-4\sqrt{130}}{12} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-4)+4\sqrt{130}}{2*6}=\frac{4+4\sqrt{130}}{12} $
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