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3(x=2)2+2x^2=3x-8
We move all terms to the left:
3(x-(2)2+2x^2)=0
We multiply parentheses
6x^2+3x-66=0
a = 6; b = 3; c = -66;
Δ = b2-4ac
Δ = 32-4·6·(-66)
Δ = 1593
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{1593}=\sqrt{9*177}=\sqrt{9}*\sqrt{177}=3\sqrt{177}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(3)-3\sqrt{177}}{2*6}=\frac{-3-3\sqrt{177}}{12} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+3\sqrt{177}}{2*6}=\frac{-3+3\sqrt{177}}{12} $
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