x(3x+2)=36

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Solution for x(3x+2)=36 equation:



x(3x+2)=36
We move all terms to the left:
x(3x+2)-(36)=0
We multiply parentheses
3x^2+2x-36=0
a = 3; b = 2; c = -36;
Δ = b2-4ac
Δ = 22-4·3·(-36)
Δ = 436
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:
$\sqrt{\Delta}=\sqrt{436}=\sqrt{4*109}=\sqrt{4}*\sqrt{109}=2\sqrt{109}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-2\sqrt{109}}{2*3}=\frac{-2-2\sqrt{109}}{6} $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+2\sqrt{109}}{2*3}=\frac{-2+2\sqrt{109}}{6} $

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