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3x(x-2)=x+8+2x
We move all terms to the left:
3x(x-2)-(x+8+2x)=0
We add all the numbers together, and all the variables
3x(x-2)-(3x+8)=0
We multiply parentheses
3x^2-6x-(3x+8)=0
We get rid of parentheses
3x^2-6x-3x-8=0
We add all the numbers together, and all the variables
3x^2-9x-8=0
a = 3; b = -9; c = -8;
Δ = b2-4ac
Δ = -92-4·3·(-8)
Δ = 177
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{-(-9)-\sqrt{177}}{2*3}=\frac{9-\sqrt{177}}{6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-9)+\sqrt{177}}{2*3}=\frac{9+\sqrt{177}}{6} $
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