中等MATH-FUNC-001
If f(x) = 2x^2 − 3x + 1, what is f(−1)?
A. 0
B. 2
C. 4
D. 6✓ 答案
解說
f(−1) = 2(1) − 3(−1) + 1 = 2 + 3 + 1 = 6. The value 0 comes from treating (−1)^2 as −1. Brackets around a negative input are essential.
f(−1) = 2(1) − 3(−1) + 1 = 2 + 3 + 1 = 6. The value 0 comes from treating (−1)^2 as −1. Brackets around a negative input are essential.