Which of the following graphs shows the preimage P(x)=x^2 and the image I(x)=P(1/3x)?




Answer:
The picture with the widest graph in red
Step-by-step explanation:
The graph P(x) is the parent graph for all quadratic functions. It has a vertex of (0,0) and has the following points:
x f(x)
-2 4
-1 1
0 0
1 1
2 4
The image of l(x) = P(1/3x) changes the points of the function to
x f(x)
-2/3 4/9
-1/3 1/9
0 0
1/3 1/9
2/3 4/9
This makes the graph much wider. The graph with the widest red graph is the graph.
Answer:
(See explanation and attachment below)
Step-by-step explanation:
The image is equal to:
[tex]I(x) = \left(\frac{1}{3}\cdot x \right)^{2}[/tex]
[tex]I(x) = \frac{1}{9}\cdot x^{2}[/tex]
Which means that [tex]I(x) = \frac{1}{9}\cdot P(x)[/tex], that is, a scale factor is applied to preimage in order to diminish growth rate of parabola at same values of x.
Some values of P(x) and I(x) are presented below:
x P(x) I(x)
0 0 0
1 1 1/9
2 4 4/9
3 9 1
The following image corresponds to both functions.