Casio fx-115ES PLUS - Inequality Calculations (INEQ)

E-43
VctA • VctB (Vector dot product)
AVctA15(VECTOR)7(Dot)VctB=
VctA × VctB (Vector cross product)
AVctA*VctB=
Obtain the absolute values of VctC.
A1w(Abs)VctC)=
Determine the angle formed by VctA and VctB to three decimal
places (Fix 3). v
(cos
 =
(A
•
B)

A

B

, which becomes  = cos
–1
(A
•
B)

A

B

)
1N(SETUP)6(Fix)3
A(VctA15(VECTOR)7(Dot)VctB)/
(1w(Abs)VctA)1w(Abs)
VctB))=
1c(cos
–1
)G)=
Inequality Calculations (INEQ)
You can use the following procedure to solve a quadratic inequality or cubic
inequality.
1. Press Nc1(INEQ) to enter the INEQ Mode.
2. On the menu that appears, select an inequality type.
To select this inequality type: Press this key:
Quadratic inequality
1(aX
2
+ bX + c )
Cubic inequality
2(aX
3
+ bX
2
+ cX + d )
3. On the menu that appears, use keys 1 through 4 to select the inequality
symbol type and orientation.
4. Use the Coefficient Editor that appears to input coefficient values.
• To solve
x
2
+ 2x – 3 < 0, for example, input the coefficients a = 1, b = 2,
c = –3 by pressing 1= 2 =- 3 =.
44
VCTVCT
55
VCTVCT
66
VCTVCT
77
VCT FIXVCT FIX
VCT FIXVCT FIX