Use the graph of the function f shown to find:

(a) Find the domain and range of f.

(b) List the intercepts

(c) Find f(-2)

(d) Find the value(s) of xfor which f(x)=-3

(e) Solve f(x)>0.

(f) Graph y=f(x-3)

(g) Graph y=f12x

(h) Graph y=-f(x)

Short Answer

Expert verified

(a) The domain of function is x|-4x3or the interval [-4,3]and the range is y|3x-3or the interval [3,-3]

(b) Origin is the only intercept for the given function

(c) f(-2)=-1

(d) f(x)=-3whenx=-4

(e) Inequality notations f(x)>0for0x3

(f) Graph fory=f(x-3)

(g) Graph for y=f12x

(h) Graph for y=-f(x)

Step by step solution

01

Step 1.Given information

The given graph

02

Step 2.Find the domain and range of f. 

The points on the graph of f have x-coordinates between -4 and 3 , inclusive. So, for each number x between -4 and 3 , there is a point (x,f(x))on the graph.

Therefore, the domain of f is x|-4x3 or [-4,3]the interval .

The points on the graph of f all have they- coordinates between 3 and -3 , inclusive.
For each value of y between 3 and -3 , there exists at least one number x in the domain.

So, the range of fis y|3x-3or the interval[3,-3] .

03

Step 3.List the intercepts 

Intercepts are the points where the graph touches the coordinate axes. Thex-intercepts have the y-coordinates 0, and they-intercepts have thex-coordinates 0.
From the graph we can see that the origin(0,0) is the only intercept.

04

Step 4.Find f(-2)

f(-2)is the value ofyon the graph when the value of x is -2 .
The point (-2,-1)on the graph corresponds to this situation. Thus, f(-2)=-1.

05

Step 5.Find the value(s) of x for which  f(x)=-3

f(x)=-3means that the value of y on the graph is -3 at a given x-value. Look for points on the graph for which the y-coordinate is -3 .

The point(-4,-3)on the graph corresponds to this situation.
Thus,f(x)=-3 , whenx=-4


06

Step 6.Solve f(x)≥0

The function f(x)>0, indicates that the y-coordinate should have positive values for each value of thex-coordinate.
In the graph, x-values from -4 to 3 are shown. Determine for which of these values the y-coordinate is positive.
The points occur on[0,3] .
So, using inequality notations, f(x)>0for 0x3

07

Step 7.Graph y=f(x-3)

Since 3 is substracted from f(x),the graph of y=f(x-3) is obtained by shifting the graph of f horigontally to the right by 3 units

08

Step 8.Graph y=f12x

The graph of f12xis the horizontally compressed versionof the graph of f(x)by a factor of 12.The function f(x)is graphed by multiplaying each x -coordinate of f(x)by 12

09

Step 9.Graph y=-f(x)

The graph of the function f(x)is the reflection of the graph of f(x) about the y-axis.The function f(x) is graphed by multiplaying the x -coordinates of f(x) by -1.

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