CASTI-89 TITANIUM · CALC89
expand(
Multiplies out products and powers in an expression and returns a sum of terms. It is the standard tool for expanding binomials and polynomial products.
Syntax
expand(expr[, var])
- Group
- Algebra
- Arguments
- Takes the expression and an optional variable; with a variable, terms are grouped by powers of that variable.
- Availability
- Included
- Menu path
- F2 Algebra ▸ expand(
Example
| Input | Result |
|---|---|
| expand((x+1)^2) | x2+2·x+1 |
Typing expand((x+1)^2) on the home screen and pressing ENTER returns x2+2·x+1.
Keystrokes on the TI-89 Titanium
F23
The same key sequence inserts expand( in Calc89, and the AI tutor shows it step by step on the on-screen keypad.
Related commands
- exp▶list(Extracts the values from a solution such as x=1 or x=2 and returns them as a list.
- factor(Factors an expression over the rational numbers, for example a polynomial into linear and irreducible quadratic factors.
- getDenom(Returns the denominator of a fraction after the expression has been reduced to a common denominator.
- getNum(Returns the numerator of a fraction after the expression has been reduced to a common denominator.
- left(Returns the left side of an equation or inequality.
- linSolve(Solves a system of linear equations and returns the values of the variables as a list.
- nSolve(Finds one real solution of an equation numerically.
- piecewise(Defines a piecewise function from pairs of values and conditions; each value applies where its condition is true.