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3x^2+2x-4=28
We move all terms to the left:
3x^2+2x-4-(28)=0
We add all the numbers together, and all the variables
3x^2+2x-32=0
a = 3; b = 2; c = -32;
Δ = b2-4ac
Δ = 22-4·3·(-32)
Δ = 388
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{388}=\sqrt{4*97}=\sqrt{4}*\sqrt{97}=2\sqrt{97}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-2\sqrt{97}}{2*3}=\frac{-2-2\sqrt{97}}{6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+2\sqrt{97}}{2*3}=\frac{-2+2\sqrt{97}}{6} $
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