How to solve
Replace each variable with its value in parentheses, then evaluate carefully.
Steps
- Put the value in parentheses where the variable was.
- Evaluate powers first, then products, then sums.
- Watch signs on negative substitutions.
Example
Evaluate 2x² − 3x at x = −2.
- 2(−2)² − 3(−2).
- 2·4 + 6 = 14.
Answer: 14
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