Question 63769
-8x^2+28x-12


=   4(-2x^2 +7x -3)  [take common 4]


=  4(-2x^2 +6x +x -3)[using the formula middle term breaking]


=  4{-2x(x-3) +(x-3)}


=  4{(x -3)(-2x +1)}[take common (x-3)]



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