1). (9+12x-4x²) -4(x + 2) (9 - 6x)
-4x² + 12x + 9 + 4x -8 (9 - 6x)
-4x² + 8x + 9 - 72 + 48x
-4x +56x - 63
2).(3-2x)² -4(x+2) (9-6x)
(3-2x) (3-2x) -4 (x+2) (9- 6x) / 3
(3-2x) (3-2x) -4 (x+2) (3-2x) (3-2x)
(3-2x) [ 3-2x -4x -8 (3-2x) ]
(3-2x) [ 3-2x -4x -24 + 16x ]
(3-2x) [ 10x + 21 ]
