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Evaluate expressions with variables
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Learn it Replace each variable with its value (use brackets for negatives), then follow BEDMAS. Remember $ab$ means $a \times b$.
Example: Find $a^2 - 3b$ when $a = 7$ and $b = 5$.
- Substitute: $7^2 - 3 \times 5$.
- Exponent: $49 - 3 \times 5$. Multiply: $49 - 15$.
- Answer: 34.
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