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6x(4x+1)=78
We move all terms to the left:
6x(4x+1)-(78)=0
We multiply parentheses
24x^2+6x-78=0
a = 24; b = 6; c = -78;
Δ = b2-4ac
Δ = 62-4·24·(-78)
Δ = 7524
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{7524}=\sqrt{36*209}=\sqrt{36}*\sqrt{209}=6\sqrt{209}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6)-6\sqrt{209}}{2*24}=\frac{-6-6\sqrt{209}}{48} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6)+6\sqrt{209}}{2*24}=\frac{-6+6\sqrt{209}}{48} $
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