a) = 4x - 3y
b) = 5x - 2a - 3x + a = 2x - a
c)- 3b + 2a + b + 3a = - 2b + 5a
d) = 6x - x² - 3x² - 2x = 4x - 4x² = 4x (1 - x)
e) = 4x² - 9x + 2x² + 10x = 6x² + x = x (6x + 1)
f) 3 + 5x² - 4 - 4x² = x² -1 = (x + 1)(x - 1)
g) = 2x²y + xy² = xy(2x + y)
h)= (2x + 4y - 6x + 3y)/ 6 = (7y - 4x)/6
i) = (15a - 9b + 8b - 4a)/6 = (11a -b)/6
