中等MATH-FUNC-008
Compared with y = f(x), the graph of y = f(2x) is
A. compressed horizontally by a factor of 1/2✓ 答案
B. stretched horizontally by a factor of 2
C. stretched vertically by a factor of 2
D. compressed vertically by a factor of 1/2
解說
The factor 2 multiplies the input, so the graph is squeezed towards the y-axis. A horizontal stretch by 2 would be y = f(x/2). A vertical stretch by 2 is y = 2 f(x).