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3x^2+12x=270
We move all terms to the left:
3x^2+12x-(270)=0
a = 3; b = 12; c = -270;
Δ = b2-4ac
Δ = 122-4·3·(-270)
Δ = 3384
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{3384}=\sqrt{36*94}=\sqrt{36}*\sqrt{94}=6\sqrt{94}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(12)-6\sqrt{94}}{2*3}=\frac{-12-6\sqrt{94}}{6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(12)+6\sqrt{94}}{2*3}=\frac{-12+6\sqrt{94}}{6} $
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