3x(2x+50)=120

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Solution for 3x(2x+50)=120 equation:



3x(2x+50)=120
We move all terms to the left:
3x(2x+50)-(120)=0
We multiply parentheses
6x^2+150x-120=0
a = 6; b = 150; c = -120;
Δ = b2-4ac
Δ = 1502-4·6·(-120)
Δ = 25380
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:
$\sqrt{\Delta}=\sqrt{25380}=\sqrt{36*705}=\sqrt{36}*\sqrt{705}=6\sqrt{705}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(150)-6\sqrt{705}}{2*6}=\frac{-150-6\sqrt{705}}{12} $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(150)+6\sqrt{705}}{2*6}=\frac{-150+6\sqrt{705}}{12} $

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