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X+2X*2X+6=86
We move all terms to the left:
X+2X*2X+6-(86)=0
We add all the numbers together, and all the variables
X+2X*2X-80=0
Wy multiply elements
4X^2+X-80=0
a = 4; b = 1; c = -80;
Δ = b2-4ac
Δ = 12-4·4·(-80)
Δ = 1281
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{-(1)-\sqrt{1281}}{2*4}=\frac{-1-\sqrt{1281}}{8} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+\sqrt{1281}}{2*4}=\frac{-1+\sqrt{1281}}{8} $
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