中等MATH-FUNC-006
The graph of y = f(x) + 3 is obtained from y = f(x) by which transformation?
A. A translation 3 units to the right
B. A translation 3 units to the left
C. A vertical stretch by factor 3
D. A translation 3 units upwards✓ 答案
解說
A constant added outside f changes the output, so the graph moves up by 3. Horizontal translations come from a change inside the brackets, such as f(x + 3).