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b. (2p - q)² = (2p)² + 2(2p)(-q) + ( -q)(-q)
= 4p² - 4pq + q²
c. (5a + 2b)² = (5a)² + 2(5a)(2b) + ( 2b)²
= 25 a² + 20ab + 4b²
d. (4x - 3y)² = (4x)² + ( 4x)(-3y) + (-3y)(-3y)
= 16x² - 12x + 9y
e. 5p²q : pq = 5p
f. 2ab² + 6a²b = 2ab (b + 3a)