1.	Factor r4 – 81.
		A.	(r + 3)2(r + 3)2	B.	(r2 + 9)(r + 3)(r - 3)
		C.	(r2 + 9)(r2 + 9)	D.	prime
		Hint
	2.	Factor
		A.		B.
		C.	prime	D.
		Hint
	3.	Solve 4y2 – 25 = 0.
		A.		B.
		C.		D.	or
		Hint
	4.	Factor 16b4 – 36b2.
		A.	2b2(4b – 3)(4b + 3)	B.	2b2(2b – 3)(2b + 3)
		C.	4b2(4b – 3)(4b + 3)	D.	4b2(2b – 3)(2b + 3)
		Hint
	5.	Suppose that we have a 3 ft. × 3 ft. piece of paper, and we cut out a square piece so that the area of the remaining piece is 5 feet. What is the length of a side of the square?
		A.	2 ft.	B.
		C.		D.	4 ft.
		Hint