If , what is ?
Answer and explanation
Correct answer: A. 31
- Step 1: Substitute into : .
- Step 2: Compute each term: so , and .
- Step 3: Combine: .
Answer
.
Why not the others: - -5 evaluates at instead of . - 63 adds all terms (). - 34 makes a sign inversion or omitted term in .
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