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2x^2-12x+18=4
We move all terms to the left:
2x^2-12x+18-(4)=0
We add all the numbers together, and all the variables
2x^2-12x+14=0
a = 2; b = -12; c = +14;
Δ = b2-4ac
Δ = -122-4·2·14
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{-(-12)-4\sqrt{2}}{2*2}=\frac{12-4\sqrt{2}}{4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-12)+4\sqrt{2}}{2*2}=\frac{12+4\sqrt{2}}{4} $
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