Put the equation in standard form and solve by factoring or using the quadratic formula.

1 - x² - x + 3 = 2x - 1

2 - x² - 3x + 2 = x - 2

3 - 10x² - 28x - 39 = 2x + 1

Basically get into ax^2+bx+c=0 form

1.

x^2-x+3=2x-1

x^2-3x+4=0

(x-4) (x+1) = 0

x-4=0

x=4

x+1=0

x=-1

x=4 or - 1

2.

x^2-3x+2=x-2

x^2-4x+4=0

(x-2) (x-2) = 0

x-2=0

x=2

3.

10x^2-28x-39=2x+1

10x^2-30x-40=0

10 (x^2-3x-4) = 0

10 (x-4) (x+1) = 0

x-4=0

x=4

x+1=0

x=-1

x=-1 or 4

1. x=-1 or 4

2. x=2

3. x=-1 or 4