2x(x+3)=2+15

Solution for 2x(x+3)=2+15 equation:

2x(x+3)=2+15

We move all terms to the left:

2x(x+3)-(2+15)=0

We add all the numbers together, and all the variables

2x(x+3)-17=0

We multiply parentheses

2x^2+6x-17=0

a = 2; b = 6; c = -17;
Δ = b2-4ac
Δ = 62-4·2·(-17)
Δ = 172
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:

$\sqrt{\Delta}=\sqrt{172}=\sqrt{4*43}=\sqrt{4}*\sqrt{43}=2\sqrt{43}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6)-2\sqrt{43}}{2*2}=\frac{-6-2\sqrt{43}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6)+2\sqrt{43}}{2*2}=\frac{-6+2\sqrt{43}}{4}
$