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Solve Quadratic Equation :

　

Calculator Model : Casio fx-3900p
Key in	MODE	EXP	P 1 or P 2	PCL	ENT	1	Kin	1
Display						1
Key in	ENT	2	Kin	2		－	4
Display		2			4
Key in	ENT	1		Kout	1	=		－
Display		1	4		1	0
Key in	Kout	2	=		2		Kout	1
Display		2	-2			-1		1
Key in	=	HLT		－	Kout	2		Kout
Display	-1		1			2
Key in	1	=	MODE
Display	1	-1
Example : Solve Solution : x = -1 or x = -2
Key in	P1	1	RUN	3	RUN	2	RUN	RUN
Display	Ent P1	1		3	4	2	-1	-2

Calculator Model : Casio fx-3800p
Key in	MODE	Exp	I or II	PCL	ENT	1	Kin	1
Display						1
Key in	ENT	2	Kin	2		－	4
Display		2			4
Key in	ENT	1		Kout	1	=		－
Display		1	4		1	0
Key in	Kout	2	=		2		Kout	1
Display		2	-2			-1		1
Key in	=	HLT		－	Kout	2		Kout
Display	-1		1			2
Key in	1	=	MODE
Example : Solve Solution : x = -1 or x = -2
Key in	I	1	RUN	3	RUN	2	RUN	RUN
Display	Ent I	1		3	4	2	-1	-2

Calculator Model : Casio fx-3600p
Key in	MODE	EXP	P 1 or P 2	PCL	ENT	1	Kin	1
Display						1
Key in	ENT	2	Kin	2		－	4
Display		2			4
Key in	ENT	1		Kout	1	=		－
Display		1	4		1	0
Key in	Kout	2	=		2		Kout	1
Display		2	-2			-1		1
Key in	=	HLT		－	Kout	2		Kout
Display	-1		1			2
Key in	1	=	MODE
Display	1	-1
Example : Solve Solution : x = -1 or x = -2
Key in	P1	1	RUN	3	RUN	2	RUN	RUN
Display	Ent P1	1		3	4	2	-1	-2

　