1. What is Expression Evaluation?

This calculator evaluates mathematical expressions containing numbers, variables, and standard arithmetic operations. It can compute the value of expressions like "2x + 3" when given values for variables.

2. How Does the Calculator Work?

The calculator processes mathematical expressions by:

• Parsing the input expression
• Substituting variable values if provided
• Evaluating the expression according to standard arithmetic rules
• Returning the computed result

3. Supported Operations

The calculator supports:

• Basic arithmetic: +, -, *, /
• Parentheses for grouping: ( )
• Variables (when values are provided)
• Decimal numbers

4. Using the Calculator

Tips:

• Enter the expression in the first field (e.g., "2x + 3")
• If using variables, specify their values in the second field (e.g., "x=5")
• For multiple variables, separate with commas (e.g., "x=5, y=10")
• Use standard mathematical notation

5. Frequently Asked Questions (FAQ)

Q1: What operations are supported?
A: Basic arithmetic (+, -, *, /), parentheses, and variables with provided values.

Q2: Can I use functions like sin() or sqrt()?
A: This basic version doesn't support mathematical functions, only simple arithmetic.

Q3: How do I specify variables?
A: In the variables field, use format "x=5" or "a=2,b=3" for multiple variables.

Q4: What happens if I don't provide values for variables?
A: The calculator will treat variables as unknown and may not evaluate the expression properly.

Q5: Are there any security concerns with expression evaluation?
A: The calculator sanitizes input to prevent code injection, but avoid entering untrusted expressions.