1.	Solve x4 - 5x2 + 4 = 0.
		A.	-1, 1	B.	-1, 1, -2i, 2i
		C.	-1, 1, -2, 2	D.	1, 2
		Hint
	2.	Solve y4 - 18y2 + 81 = 0.
		A.	-3, 3	B.	3, 3i
		C.	-3, 3, -3i, 3i	D.	3
		Hint
	3.	Solve .
		A.	16	B.	-4, 2
		C.	4, 16	D.	4
		Hint
	4.	Write the expression in quadratic form.
		A.		B.
		C.		D.
		Hint
	5.	Solve
		A.	Solutions are –1 and 3125.	B.	Solutions are 1 and .
		C.	Solutions are 1 and 3125.	D.	Solutions are –1, 1, and 3125.
		Hint