Adding a subtracting expressions, what do we need?
To add or subtract expressions, we need the following:
1. The expressions: We need the numbers or variables that we want to add or subtract. Examples of expressions could be 3x+5 or 2(a - b).
2. The operation sign: We need to determine whether we want to add or subtract the expressions. The addition sign (+) is used for adding, and the subtraction sign (-) is used for subtracting.
3. Parentheses or brackets: If there are multiple terms or operations within the expressions, we may need to group them using parentheses or brackets to ensure the correct order of operations.
4. The ability to simplify: After adding or subtracting the expressions, we need to simplify the result, if possible, by combining like terms or performing any other necessary mathematical operations.
Overall, adding or subtracting expressions requires the expressions themselves, the correct operation sign, appropriate grouping symbols, and the ability to simplify the result.