(x-2)(x+1)=3x-4
solve

X^2 + x - 2x - 2 = 3x - 4 
x^2 - x - 2 = 3x - 4 
x^2 - x - 3x - 2 + 4 = 0
x^2 - 4x + 2 = 0 ;
 is the quadratic formula ;
a = 1 ; b = -4 ; c = + 2 ;
The solutions are ( - 1 + ) / 2 and ( - 1 - ) / 2 ;

╔═⋄═◇═◈═❖═✧═☆═✧═❖═◈═◇═⋄╗✧   ok, now this, is epic.╚═⋄═◇═◈═❖═✧═☆═✧═❖═◈═◇═⋄╝