1.	Factor r4 – 81.
		A.	prime	B.	(r2 + 9)(r + 3)(r - 3)
		C.	(r2 + 9)(r2 + 9)	D.	(r + 3)2(r + 3)2
		Hint
	2.	Factor 7xy2 - 28x3
		A.	7x(y + 2x)(y - 2x)	B.	7x2y2(1 + x)
		C.	(7xy + x)(y – 28x2)	D.	prime
		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(2b – 3)(2b + 3)	D.	4b2(4b – 3)(4b + 3)
		Hint
	5.	Factor 3x3 + 3x2 – 12x – 12.
		A.	3(x – 2)(x + 2)(x + 1)	B.	3(x – 2)(x – 2)(x + 1)
		C.	(x – 2)(x + 2)(x + 1)	D.	(x – 2)(x – 2)(x + 1)
		Hint