5x(+2)-2(3x-1)=13-1

Solution for 5x(+2)-2(3x-1)=13-1 equation:

5x(+2)-2(3x-1)=13-1

We move all terms to the left:

5x(+2)-2(3x-1)-(13-1)=0

We add all the numbers together, and all the variables

5x2-2(3x-1)-12=0

We add all the numbers together, and all the variables

5x^2-2(3x-1)-12=0

We multiply parentheses

5x^2-6x+2-12=0

We add all the numbers together, and all the variables

5x^2-6x-10=0

a = 5; b = -6; c = -10;
Δ = b2-4ac
Δ = -62-4·5·(-10)
Δ = 236
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:

$\sqrt{\Delta}=\sqrt{236}=\sqrt{4*59}=\sqrt{4}*\sqrt{59}=2\sqrt{59}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-6)-2\sqrt{59}}{2*5}=\frac{6-2\sqrt{59}}{10}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-6)+2\sqrt{59}}{2*5}=\frac{6+2\sqrt{59}}{10}
$