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2x-4-2x=-(8x+2)x
We move all terms to the left:
2x-4-2x-(-(8x+2)x)=0
We add all the numbers together, and all the variables
-(-(8x+2)x)-4=0
We calculate terms in parentheses: -(-(8x+2)x), so:We get rid of parentheses
-(8x+2)x
We multiply parentheses
-8x^2-2x
Back to the equation:
-(-8x^2-2x)
8x^2+2x-4=0
a = 8; b = 2; c = -4;
Δ = b2-4ac
Δ = 22-4·8·(-4)
Δ = 132
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{132}=\sqrt{4*33}=\sqrt{4}*\sqrt{33}=2\sqrt{33}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-2\sqrt{33}}{2*8}=\frac{-2-2\sqrt{33}}{16} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+2\sqrt{33}}{2*8}=\frac{-2+2\sqrt{33}}{16} $
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