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Simplifying
To simplify an expression that combines integer multiplication with addition and subtraction, follow the order of operations — perform all multiplications before any additions or subtractions:
- Multiply first: Compute each product: (different signs produce a negative) and (different signs produce a negative). The expression becomes .
- Add: Combine (same signs — add the absolute values and keep the negative sign). The expression becomes .
- Subtract: Compute .
The final result is . This problem shows that when an expression mixes multiplication with addition and subtraction and contains no grouping symbols, all multiplications must be completed first; then the additions and subtractions are performed from left to right.
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Ch.1 Foundations - Elementary Algebra @ OpenStax
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Learn After
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