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b.x²+4x-1-2x²-4x=x²-1
c.y²-3-4y²-5y-6=-3y²-5y-9
d.5a-6+ab-a-2ab+a=5a-ab-6
= 2x - x + 5 + 3
= x + 8
b. (x² + 4x - 1) - (2x² + 4x) = x² + 4x - 1 - 2x² - 4x
= x² - 2x² + 4x - 4x - 1
= -x² - 1
c. (y² - 3) - (4y² + 5y + 6) = y² - 3 - 4y² - 5y - 6
= y² - 4y² - 5y - 3 - 6
= -3y² -5y - 9
d. (5a - 6 + ab) - (a + 2ab - a) = 5a - 6 + ab - a - 2ab + a
= 5a - a + a + ab - 2ab - 6
= 5a - ab - 6