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b.6y² - 8 y + y² - 2y = 6y² + y² - 8y - 2y
= 7y² -10y
c.18x -5(x - 3y) = 18x - 5x + 15y
= 13x + 15y
d.a(a + 3b) + 2a(4a + 5b) = a² + 3ab + 8a² + 10ab
=a² + 8a² + 3ab + 10ab
=9a² + 13 ab