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2x(x+5)=6x+2
We move all terms to the left:
2x(x+5)-(6x+2)=0
We multiply parentheses
2x^2+10x-(6x+2)=0
We get rid of parentheses
2x^2+10x-6x-2=0
We add all the numbers together, and all the variables
2x^2+4x-2=0
a = 2; b = 4; c = -2;
Δ = b2-4ac
Δ = 42-4·2·(-2)
Δ = 32
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{32}=\sqrt{16*2}=\sqrt{16}*\sqrt{2}=4\sqrt{2}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(4)-4\sqrt{2}}{2*2}=\frac{-4-4\sqrt{2}}{4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(4)+4\sqrt{2}}{2*2}=\frac{-4+4\sqrt{2}}{4} $
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