1.	Solve y4 - 18y2 + 81 = 0.
		A.	3	B.	3, 3i
		C.	-3, 3	D.	-3, 3, -3i, 3i
		Hint
	2.	Solve .
		A.	4	B.	16
		C.	-4, 2	D.	4, 16
		Hint
	3.	Write the expression in quadratic form.
		A.		B.
		C.		D.
		Hint
	4.	Solve x4 – 625 = 0
		A.		B.
		C.	5, 5i	D.
		Hint
	5.	Which expression cannot be written in quadratic form?
		A.		B.
		C.		D.
		Hint