x(x+3)=2(12)

Solution for x(x+3)=2(12) equation:

x(x+3)=2(12)

We move all terms to the left:

x(x+3)-(2(12))=0

determiningTheFunctionDomain
x(x+3)-212=0

We multiply parentheses

x^2+3x-212=0

a = 1; b = 3; c = -212;
Δ = b2-4ac
Δ = 32-4·1·(-212)
Δ = 857
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(3)-\sqrt{857}}{2*1}=\frac{-3-\sqrt{857}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+\sqrt{857}}{2*1}=\frac{-3+\sqrt{857}}{2}
$