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4(x+2)=(2x)2+8x
We move all terms to the left:
4(x+2)-((2x)2+8x)=0
We add all the numbers together, and all the variables
-(+2x^2+8x)+4(x+2)=0
We multiply parentheses
-(+2x^2+8x)+4x+8=0
We get rid of parentheses
-2x^2-8x+4x+8=0
We add all the numbers together, and all the variables
-2x^2-4x+8=0
a = -2; b = -4; c = +8;
Δ = b2-4ac
Δ = -42-4·(-2)·8
Δ = 80
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{80}=\sqrt{16*5}=\sqrt{16}*\sqrt{5}=4\sqrt{5}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-4)-4\sqrt{5}}{2*-2}=\frac{4-4\sqrt{5}}{-4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-4)+4\sqrt{5}}{2*-2}=\frac{4+4\sqrt{5}}{-4} $
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