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Quadratic, Cubic and Quart Equations
Quadratic equation : ax
2
+ bx + c = 0 (a second-order polynomial
equation with a single variable x)
Cubic equation
: ax
3
+ bx
2
+ cx + d = 0 (an equation with cubic
polynomial)
Quart equation
: ax
4
+ bx
3
Example: Solve the cubic equation 5x
EX #45
For quadratic, cubic or quart equations, the variable name starts
with "X
".
1
Solve Function
You can solve custom calculation expressions in COMP mode.
Simply input the expression with different variables and press the
key.
• Solves for X, for example, when an equation is input as:
X = Y + 5, X
• Solves for Y, for example, when an equation is input as:
Y = X + 5, Y
Example: A cone with height "h' and a circular base with radius "r"; find
the cone volume using this formula:
X
Replace the variable "V" with X, variable "r"
with "B", and variable "h" with "C".
Radius is 5cm, cone height is 20cm, calculate
the cone volume. And if the cone volume is
200cm
3
, with radius 2cm, calculate the
cone height. ......
EX #46
+ cx
2
+ dx + e = 0
3
+ 2x
2
– 2x + 1 = 0
h
r
! If the expression does not have the equal sign ( = ) and perform
the Solve calculation, the calculator will transform the solution as
zero ( 0 ).
! Solve function cannot be solved an equation.
! When the expression cannot be solved, [Solve ERROR] will be
displayed.
CALC Function
CALC function is a memory zone with a maximum of 79
steps to store a single calculation expression which can be
recalled and calculated a number of times with different
values.
After inputting the calculation expression and pressing
the calculator will request for the current value of your input
variables.
CALC function can only be used in COMP mode or CPLX
mode.
Example: For the equation Y = 5x
x = 5 or x = 7. ......
! The
stored expression will be cleared as you start a new
calculation, change into another mode, or turn off the calculator.
s
20
2
–2x +1, calculate the value of Y if
EX #47
,
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