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(3x+8)(x)=330
We move all terms to the left:
(3x+8)(x)-(330)=0
We multiply parentheses
3x^2+8x-330=0
a = 3; b = 8; c = -330;
Δ = b2-4ac
Δ = 82-4·3·(-330)
Δ = 4024
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{4024}=\sqrt{4*1006}=\sqrt{4}*\sqrt{1006}=2\sqrt{1006}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(8)-2\sqrt{1006}}{2*3}=\frac{-8-2\sqrt{1006}}{6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(8)+2\sqrt{1006}}{2*3}=\frac{-8+2\sqrt{1006}}{6} $
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