Examples with solutions for Increasing and Decreasing Intervals of a Function: Drawing conclusions from a table or graph

Exercise #1

In which domain is the function increasing?

f(x)x-57-1.58-110014215343.5250

Video Solution

Step-by-Step Solution

Remember that the function increases when X values and Y values increase simultaneously.

On the other hand, the function decreases when X values increase and Y values decrease simultaneously.

According to the given value table, we can see that in the domain wherex<2 x < 2 the X values and Y values increase simultaneously.

Therefore, the function increases in the domain where

x<2 x < 2

Answer

x<2 x<2

Exercise #2

In which domain does the function decrease?

f(x)x-24-110011721151671911

Video Solution

Step-by-Step Solution

Remember that the function increases when X values and Y values increase simultaneously.

On the other hand, the function decreases when X values increase and Y values decrease simultaneously.

According to the given value table, we can see that in the domain wherex<0 x < 0 X values increase and Y values decrease simultaneously.

Therefore, the function decreases in the domain where

x<0 x < 0

Answer

x<0 x<0

Exercise #3

In which domain does the function decrease?

f(x)x-210-1.58-160423353.57109

Video Solution

Step-by-Step Solution

Let's remember that a function is increasing if both x x values and y y values are increasing simultaneously.

A function is decreasing if x x values are increasing while y y values are decreasing simultaneously.

According to the value table, we can see that in the domain x<2 x < 2 , thex x values are increasing while the y y values are decreasing simultaneously. Therefore, the function is decreasing in the domain x<2 x < 2 .

Answer

x<2 x<2

Exercise #4

In which domain does the function decrease?

f(x)x-57-1.58-110014215303.5250

Video Solution

Step-by-Step Solution

To solve this problem, we'll examine each interval provided between the points for f(x) f(x) from the graph, checking where  f(x)\ f(x) decreases:

  • Step 1: Look at the interval 2<x<3 2 < x < 3 .
    - For x=2 x = 2 ,  f(x)=15\ f(x) = 15 and for x=3 x = 3 ,  f(x)=0\ f(x) = 0 .
    - Since 150 15 \to 0 as x x moves from 2 to 3, the function decreases. Thus, this interval is decreasing.
  • Step 2: Examine the interval x>3.5 x > 3.5 .
    - For x=3.5 x = 3.5 ,  f(x)=2\ f(x) = 2 at the starting point, and it decreases beyond this point.
    - Since we need to find where f(x) f(x) decreases, and the function decreases as it's moving towards a lower value from this point, this indeed indicates a decreasing domain.

Therefore, the intervals where the function decreases are 2<x<3 2 < x < 3 and x>3.5 x > 3.5 .

The solution to this problem is that Answers B and C are correct, identifying the domains where f(x) f(x) decreases.

Answer

Answers B and C are correct

Exercise #5

In which domain is the function increasing?

f(x)x-44-1100116210014-78-9

Video Solution

Step-by-Step Solution

Remember that the function increases when X values and Y values increase simultaneously.

On the other hand, the function decreases when X values increase and Y values decrease simultaneously.

According to the given value table, we can see that in the domain where10>x>0 10 > x > 0 the X values and Y values increase simultaneously.

Therefore, the function increases in the domain where

10>x>0 10 > x > 0

Answer

10>x>0 10 > x > 0

Exercise #6

In which domain is the function increasing?

f(x)x-210-1.58-0.560021353.5759

Video Solution

Step-by-Step Solution

Remember that the function increases when X values and Y values increase simultaneously.

On the other hand, the function decreases when X values increase and Y values decrease simultaneously.

According to the given value table, we can see that in the domain wherex>0 x > 0 the X values and Y values increase simultaneously.

Therefore, the function increases in the domain where

x>0 x > 0

Answer

x>0 x>0

Exercise #7

In which domain does the function decrease?

f(x)x001223354352607-4

Video Solution

Step-by-Step Solution

Remember that the function increases when X values and Y values increase simultaneously.

On the other hand, the function decreases when X values increase and Y values decrease simultaneously.

According to the given value table, we can see that in the domain wherex>3 x > 3 X values increase and Y values decrease simultaneously.

Therefore, the function decreases in the domain where

x>3 x > 3

Answer

x>3 x>3

Exercise #8

In which domain is the function increasing?

f(x)x-104-48-211010213-54-75-9

Video Solution

Step-by-Step Solution

Remember that the function increases when X values and Y values increase simultaneously.

On the other hand, the function decreases when X values increase and Y values decrease simultaneously.

According to the given value table, we can see that in the domain wherex<2 x < -2 the X values and Y values increase simultaneously.

Therefore, the function increases in the domain where

x<2 x < -2

Answer

x<2 x<-2

Exercise #9

In which domain is the function increasing?

f(x)x-54-11102-14-25-57-78-9

Video Solution

Step-by-Step Solution

Remember that the function increases when X values and Y values increase simultaneously.

On the other hand, the function decreases when X values increase and Y values decrease simultaneously.

According to our given value table, we can see that X values increase while Y values decrease simultaneously.

Therefore, the function decreases throughout its domain, and there is no domain where it increases.

Answer

No upward dominance

Exercise #10

In which domain is the function increasing?

x-1010-78-360425463.5789

Video Solution

Step-by-Step Solution

Remember that the function increases when X values and Y values increase simultaneously.

On the other hand, the function decreases when X values increase and Y values decrease simultaneously.

According to the given value table, we can see that in the domain where0>x 0 > x X values and Y values increase simultaneously.

Therefore, the function increases in the domain where

x>0 x > 0

Answer

x>0 x>0

Exercise #11

In which domain is the function increasing?

x-24-1100111.52305-78-9

Video Solution

Step-by-Step Solution

Remember that the function increases when X values and Y values increase simultaneously.

On the other hand, the function decreases when X values increase and Y values decrease simultaneously.

According to the given value table, we can see that in the domain where1.5>x>0 1.5 > x > 0 the X values and Y values increase simultaneously.

Therefore, the function increases in the domain where

1.5>x>0 1.5 > x > 0

Answer

1.5>x>0 1.5>x>0

Exercise #12

In which domain does the function decrease?

x-210-1.58-0.560021353.5759

Video Solution

Step-by-Step Solution

Remember that the function increases when X values and Y values increase simultaneously.

On the other hand, the function decreases when X values increase and Y values decrease simultaneously.

According to the given value table, we can see that in the domain wherex<0 x < 0 X values increase and Y values decrease simultaneously.

Therefore, the function decreases in the domain where

x<0 x < 0

Answer

x<0 x<0

Exercise #13

In which domain is the function increasing?

f(x)x-24-1100112.52305-78-9

Video Solution

Step-by-Step Solution

Note that the function increases when X values and Y values increase simultaneously.

On the other hand, the function decreases when X values increase and Y values decrease simultaneously.

According to the given value table, we can see that in the domain where2.5>x>0 2.5 > x > 0 the X values and Y values increase simultaneously.

Therefore, the function increases in the domain where

2.5>x>0 2.5 > x > 0

Answer

2.5>x>0 2.5>x>0

Exercise #14

In which domain is the function increasing?

f(x)x001223354352607-4

Video Solution

Step-by-Step Solution

Note that the function increases when X values and Y values increase simultaneously.

On the other hand, the function decreases when X values increase and Y values decrease simultaneously.

According to the given value table, we can see that in the domain wherex<3 x < 3 the X values and Y values increase simultaneously.

Therefore, the function increases in the domain where

x<3 x < 3

Answer

x<3 x<3

Exercise #15

In which domain is the function increasing?

f(x)x-210-1.58-0.560112133183.520526

Video Solution

Step-by-Step Solution

Remember that the function increases when X values and Y values increase simultaneously.

On the other hand, the function decreases when X values increase and Y values decrease simultaneously.

According to the given value table, we can see that in the domain wherex>0.5 x > -0.5 the X values and Y values increase simultaneously.

Therefore, the function increases in the domain where

x>0.5 x > -0.5

Answer

x>0.5 x>-0.5