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3x^2+6x-30=14
We move all terms to the left:
3x^2+6x-30-(14)=0
We add all the numbers together, and all the variables
3x^2+6x-44=0
a = 3; b = 6; c = -44;
Δ = b2-4ac
Δ = 62-4·3·(-44)
Δ = 564
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{564}=\sqrt{4*141}=\sqrt{4}*\sqrt{141}=2\sqrt{141}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6)-2\sqrt{141}}{2*3}=\frac{-6-2\sqrt{141}}{6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6)+2\sqrt{141}}{2*3}=\frac{-6+2\sqrt{141}}{6} $
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