Fnint, Using the equation solver, Solver – Texas Instruments TI-84 User Manual

Page 64

Chapter 2: Math, Angle, and Test Operations

fnInt(

fnInt(

(function integral) returns the numerical integral (Gauss-Kronrod method) of

expression

with respect to

variable

, given

lower

limit,

upper

limit, and a

tolerance

(if not

specified, the default is 1

âL5).

fnInt(

is valid only for real numbers.

fnInt(expression,variable,lower,upper

[

,tolerance

]

)

Note:

To speed the drawing of integration graphs (when

fnInt(

is used in a Y= equation),

increase the value of the

Xres

window variable before you press

Using the Equation Solver

Solver

Solver

displays the equation solver, in which you can solve for any variable in an

equation. The equation is assumed to be equal to zero.

Solver

is valid only for real

numbers.

When you select

Solver

, one of two screens is displayed.

•

The equation editor (see step 1 picture below) is displayed when the equation
variable

eqn

is empty.

•

The interactive solver editor is displayed when an equation is stored in

eqn