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F(x)=
-1/3x-4 , −9≤x<0
2x , 0≤x≤4
What is the graph of f?

User Micho Rizo
by
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1 Answer

2 votes

Answer:

Explanation:

To graph the function f(x), we need to plot the points for the different intervals and connect them to create a continuous line. Let's break it down into two parts:

1. For the interval -9 ≤ x < 0:

The equation for this interval is f(x) = (-1/3)x - 4. We can select some values for x within this interval and calculate the corresponding values of f(x). Let's choose x = -9, -6, -3, -1.

For x = -9:

f(-9) = (-1/3)(-9) - 4 = 3 - 4 = -1

So, we have the point (-9, -1).

For x = -6:

f(-6) = (-1/3)(-6) - 4 = 2 - 4 = -2

So, we have the point (-6, -2).

For x = -3:

f(-3) = (-1/3)(-3) - 4 = 1 - 4 = -3

So, we have the point (-3, -3).

For x = -1:

f(-1) = (-1/3)(-1) - 4 = 1/3 - 4 = -3 2/3 ≈ -3.67

So, we have the point (-1, -3.67).

Plot these points on the graph.

2. For the interval 0 ≤ x ≤ 4:

The equation for this interval is f(x) = 2x. Similarly, we can select some values for x within this interval and calculate the corresponding values of f(x). Let's choose x = 0, 1, 2, 4.

For x = 0:

f(0) = 2(0) = 0

So, we have the point (0, 0).

For x = 1:

f(1) = 2(1) = 2

So, we have the point (1, 2).

For x = 2:

f(2) = 2(2) = 4

So, we have the point (2, 4).

For x = 4:

f(4) = 2(4) = 8

So, we have the point (4, 8).

Plot these points on the graph.

Now, connect the points for the respective intervals with a continuous line segment. The line segment for the interval -9 ≤ x < 0 will have a negative slope, and the line segment for the interval 0 ≤ x ≤ 4 will have a positive slope.

Your graph of f(x) will have a downward-sloping line from (-9, -1) to (-1, -3.67), and then it will have an upward-sloping line from (0, 0) to (4, 8).

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