A= 3x + 5x (4-2x) - 2(x² -3x +5)
A= 3x + 20x - 10x² - 2x² + 6x - 10
A = -10x² -2x² + 3x + 20x + 6x - 10
A= -12x² + 29x - 10
B = (4x +5) ( 2x +6) - (x +1) ( x +5)
B= 8x² + 24x + 10x + 30 - (x² + 5x + x + 5)
B= 8x² + 24x + 10x + 30 - x² - 5x - x - 5
B= 7x² + 28 x + 25