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3x(4x+6)=24
We move all terms to the left:
3x(4x+6)-(24)=0
We multiply parentheses
12x^2+18x-24=0
a = 12; b = 18; c = -24;
Δ = b2-4ac
Δ = 182-4·12·(-24)
Δ = 1476
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{1476}=\sqrt{36*41}=\sqrt{36}*\sqrt{41}=6\sqrt{41}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(18)-6\sqrt{41}}{2*12}=\frac{-18-6\sqrt{41}}{24} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(18)+6\sqrt{41}}{2*12}=\frac{-18+6\sqrt{41}}{24} $
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