Displaying The Solver And Entering An Equation - Texas Instruments TI-89 Manual Book

Displaying the Solver and Entering an Equation

Displaying the
Numeric Solver
Entering an
Equation
Tips: In your equation:
Do not use system
function names (such as
y1(x) or r1(q)) as simple
variables (y1 or r1) .
Be careful with implied
multiplication. For
example, a(m2+m1) is
treated as a function
reference, not as
aù (m2+m1) .
Note: When you define the
variables, you can either
define exp or solve for it.
Note: After you press ¸
the current equation is
stored automatically to the
system variable eqn .
After you display the Numeric Solver, start by entering the
equation that you want to solve.
To display the Numeric Solver, press
O
9.
The Numeric Solver screen shows the
last entered equation, if any.
On the line, type in your
eqn:
equation.
You can:
Type an equation
directly.
Refer to a function or
equation defined
elsewhere.
Type an expression
without an = sign.
Recall a previously
entered equation or
open a saved
equation.
For example:
a=(m2ì m1)/(m2+m1)ù g
a+b=c+sin(d)
Suppose you defined
y1(x)
¦
Y= Editor:
y1(x)=1.25xù cos(x)
– or –
¦
Home screen:
Define y1(x)=1.25xù cos(x)
In the Numeric Solver, you then would enter:
or
y1(x)=0 y1(t)=0, etc.
The argument does not have to
match the one used to define the
function or equation.
e+fì ln(g)
After you press ¸, the expression is set
equal to a system variable called
entered as:
exp=e+fì ln(g)
Refer to the applicable heading later in this
section.
Chapter 19: Numeric Solver
on either the:
and
exp
335