Question

The graph of f(x) = StartRoot x EndRoot is reflected over the y-axis. Use the graphing calculator to graph this reflection. Which list contains three points that lie on the graph of the reflection?

(–81, 9), (–36, 6), (–1, 1)
(1, –1), (16, –4), (36, –6)
(–49, 7), (–18, 9), (–1, 1)
(1, –1), (4, –16), (5, –25)

Answer 1

Reflecting across the y-axis maps (x,y) to (−x,y). Since f(x)=√x has points (81,9), (36,6), (1,1), their reflections are (−81,9), (−36,6), (−1,1).

So the correct list is: (–81, 9), (–36, 6), (–1, 1).