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4x(2)+2x(2)+3x-x=30
We move all terms to the left:
4x(2)+2x(2)+3x-x-(30)=0
We add all the numbers together, and all the variables
6x^2+2x-30=0
a = 6; b = 2; c = -30;
Δ = b2-4ac
Δ = 22-4·6·(-30)
Δ = 724
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{724}=\sqrt{4*181}=\sqrt{4}*\sqrt{181}=2\sqrt{181}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-2\sqrt{181}}{2*6}=\frac{-2-2\sqrt{181}}{12} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+2\sqrt{181}}{2*6}=\frac{-2+2\sqrt{181}}{12} $
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