# Difference between revisions of "Simplifier-entering formulas"

From Algebra.Com's Help

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*DO use multiplication sign '*' (the STAR) symbol. For the simplifier, xy is NOT the same as x*y or yx. Simplifier thinks that xy is a separate variable. '''Good example:''' x*y-y*(x+2). '''Bad example''': xy-y(x+2). | *DO use multiplication sign '*' (the STAR) symbol. For the simplifier, xy is NOT the same as x*y or yx. Simplifier thinks that xy is a separate variable. '''Good example:''' x*y-y*(x+2). '''Bad example''': xy-y(x+2). | ||

*DO use '*' when multiplying a variable by an expression in parentheses: x*(x+2). Otherwise, my simplifier will think that you are trying to use a function and will become confused. | *DO use '*' when multiplying a variable by an expression in parentheses: x*(x+2). Otherwise, my simplifier will think that you are trying to use a function and will become confused. | ||

− | *Use parentheses liberally to avoid any ambiguity. (x+y)/(x-y) is NOT the same as x+y/x-y. | + | *Use parentheses liberally to avoid any ambiguity. (x+y)/(x-y) is NOT the same as x+y/x-y. x+y/x-y means x+(y/x)-y. |

==Operations== | ==Operations== |

## Revision as of 12:22, 8 July 2005

## Contents

## Entering formulas for simplifier

The formulas that my simplifier simplifies, are entered the same way as in my formula plotting system. However, to simplify a formula, it needs to be understood much deeper than when we just want to draw it as a picture. Therefore, there are some important **requirements**.

## Requirements

- DO use multiplication sign '*' (the STAR) symbol. For the simplifier, xy is NOT the same as x*y or yx. Simplifier thinks that xy is a separate variable.
**Good example:**x*y-y*(x+2).**Bad example**: xy-y(x+2). - DO use '*' when multiplying a variable by an expression in parentheses: x*(x+2). Otherwise, my simplifier will think that you are trying to use a function and will become confused.
- Use parentheses liberally to avoid any ambiguity. (x+y)/(x-y) is NOT the same as x+y/x-y. x+y/x-y means x+(y/x)-y.

## Operations

- Use '*' (STAR) for multiplication. 2*3 is legal, 2x3 will be misunderstood.
- Use '^' (CARET) for power. 2^3 means 2 to degree of 3, or 8.
- Use '/' (FORWARD SLASH) for division
- Only '(' and ')' (parentheses) are allowed for grouping terms. Curly or square brackets are used for other purposes.

Operation priority: + and - have lowest priority, * and / h

## Good Examples

x*y-x*(y+2) <-- '*' is used for multiplications a^b*3 <-- means (a to the degree of b) multiplied by 3

## Bad examples

xy-yx <-- variable xy and variable yx are different variables y(x-2) <-- simplifier will think that it is function y of x-2.