If , what is ?
Answer and explanation
Correct answer: C. 19
- Step 1: Substitute into : .
- Step 2: Compute each term: so , and .
- Step 3: Combine: .
Answer
.
Why not the others: - 7 treats as (). - 1 is the constant term of the function. - 22 makes a sign inversion or omitted term.
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