If , what is ?
Answer and explanation
Correct answer: A. 6
- Step 1: Substitute into : .
- Step 2: Compute each term: , and .
- Step 3: Add the terms: .
Answer
.
Why not the others: - 7 makes a sign inversion or omitted term in . - 4 treats as with an arithmetic offset. - -2 makes a sign miscalculation on the linear term ().
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