1.	Which equation is in quadratic form?
		A.	3x3 + 3x + 3 = 0	B.
		C.		D.	x4 - x2 + x - 1 = 0
		Hint
	2.	Solve x4 - 5x2 + 4 = 0.
		A.	-1, 1, -2, 2	B.	-1, 1, -2i, 2i
		C.	-1, 1	D.	1, 2
		Hint
	3.	Solve .
		A.	-4, 2	B.	4, 16
		C.	4	D.	16
		Hint
	4.	Write the expression in quadratic form.
		A.		B.
		C.		D.
		Hint
	5.	Solve x4 – 625 = 0
		A.		B.
		C.	5, 5i	D.
		Hint