Question 251878
Yes the negative 2x changes your equation but it doesn't make it any easier or nicer to solve.
You can't factor this one.
You either need to complete the square or use the quadratic formula
I'll show you complete the square.
And I'll send along the quadratic formula method
Let's start with
x^2-2x=13
so we take the 1/2 of the 2 =1 and square it which still equals 1
add 1 to both sides
x^2-2x+1=14

factor (x-1)^2=14
|x-1|=sqrt(14)
x=1+\-sqrt(14)
----x=1-sqrt(14)= -2.74166---
---x=1+sqrt(14)= 4.74166---
where sqrt(14)=3.74166

*[invoke quadratic "x", 1, -2, -13 ]