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2x^2+4x+6x=13
We move all terms to the left:
2x^2+4x+6x-(13)=0
We add all the numbers together, and all the variables
2x^2+10x-13=0
a = 2; b = 10; c = -13;
Δ = b2-4ac
Δ = 102-4·2·(-13)
Δ = 204
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{204}=\sqrt{4*51}=\sqrt{4}*\sqrt{51}=2\sqrt{51}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(10)-2\sqrt{51}}{2*2}=\frac{-10-2\sqrt{51}}{4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(10)+2\sqrt{51}}{2*2}=\frac{-10+2\sqrt{51}}{4} $
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