1.	Which equation is in quadratic form?
		A.		B.	3x3 + 3x + 3 = 0
		C.		D.	x4 - x2 + x - 1 = 0
		Hint
	2.	Solve y4 - 18y2 + 81 = 0.
		A.	-3, 3, -3i, 3i	B.	3, 3i
		C.	-3, 3	D.	3
		Hint
	3.	Write the expression in quadratic form.
		A.		B.
		C.	cannot be done, since	D.
		Hint
	4.	Which expression cannot be written in quadratic form?
		A.		B.
		C.		D.
		Hint
	5.	Solve
		A.		B.	1, 11.31
		C.		D.	1, 1.22
		Hint