Question

Given that (1,-2) is on the graph, find the corresponding point for the function 4f(x).

Answer 1

(1, -8)

Explanation:

The transformation 4f(x) means the y-value is multiplied by 4, while the x-value stays the same.

... f(1) = -2

... 4f(1) = 4×(-2) = -8

... (1, -2) ⇒ (1, -8) . . . . vertical expansion by a factor of 4