1.	Which equation is in quadratic form?
		A.		B.	x4 - x2 + x - 1 = 0
		C.	3x3 + 3x + 3 = 0	D.
		Hint
	2.	Solve x4 - 5x2 + 4 = 0.
		A.	-1, 1, -2i, 2i	B.	1, 2
		C.	-1, 1, -2, 2	D.	-1, 1
		Hint
	3.	Solve
		A.	Solutions are 1 and 3125.	B.	Solutions are –1, 1, and 3125.
		C.	Solutions are –1 and 3125.	D.	Solutions are 1 and .
		Hint
	4.	Solve x4 – 625 = 0
		A.		B.
		C.	5, 5i	D.
		Hint
	5.	Solve
		A.	1, 11.31	B.
		C.		D.	1, 1.22
		Hint