CASTI-89 TITANIUM · CALC89
comDenom(
Combines a sum of fractions into one reduced fraction over a common denominator. Useful for simplifying rational expressions before solving or integrating.
Syntax
comDenom(expr[, var])
- Group
- Algebra
- Arguments
- Takes the expression and an optional variable that controls how numerator and denominator are expanded.
- Availability
- Included
- Menu path
- F2 Algebra ▸ comDenom(
Example
| Input | Result |
|---|---|
| comDenom(2+1/x) | (2·x+1)/x |
Typing comDenom(2+1/x) on the home screen and pressing ENTER returns (2·x+1)/x.
Keystrokes on the TI-89 Titanium
F26
The same key sequence inserts comDenom( in Calc89, and the AI tutor shows it step by step on the on-screen keypad.
Related commands
- completeSquare(Rewrites a quadratic expression in completed square form.
- cPolyRoots(Returns all roots of a polynomial as a list, including non-real complex roots.
- cSolve(Solves an equation over the complex numbers and returns both real and non-real solutions.
- cZeros(Returns the real and non-real zeros of an expression as a list.
- domain(Returns the domain of an expression with respect to a variable as a condition, for example x≠0.
- exact(Converts a decimal or approximate value into an exact rational form where possible.
- expand(Multiplies out products and powers in an expression and returns a sum of terms.
- exp▶list(Extracts the values from a solution such as x=1 or x=2 and returns them as a list.