Functions and Graphs 2 Flashcards

1
Q

What is ALWAYS used to write where a graph is increasing, decreasing, or remains constant.

A

Open intervals on the x-axis (because behavior at endpoints is excluded).

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2
Q

From what to what direction should evaluation of a graph happen when determining the increasing, decreasing, or constant states of a graph?

A

From left to right.

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3
Q

What’s a relative maximum in a graph?

A

A relative maximum is the greatest y value in a local(small) area of a graph. It is called relative, or local, because it doesn’t relate to the whole graph but for a small portion of it instead.

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4
Q

What is reffered to as a relative “peak” in graphs?

A

The relative maximum of that specific area.

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5
Q

What’s a relative minimum?

A

A point on a graph where the graph goes from decreasing to increasing. Aka the lowest point.

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6
Q

What’s used as an answer when asked for the location of a relative maximum/minimum?

A

The x value of that specific point.

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7
Q

What’s used as an answer when asked for the relative maximum of a specific point?

A

The y value of that point.

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8
Q

What does the word “symmetria” mean?

A

The same measure.

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9
Q

Find the relative maximum and its location for the function f(x) = x^3-3x.

A

Relative maximum location -1, the value of the relative maximum = 2.

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10
Q

What’s the definition for a symmetric graph with respect to the y-axis?

A

A graph is symmetric with respect to the y-axis if for every (x,y) point on the graph, the point (-x,y) is also on the graph.

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11
Q

What’s the definition for a symmetric graph with respect to the x-axis?

A

A graph is symmetric with respect to the x-axis if for every point (x,y) on the graph, the point (x,-y) is also on the graph.

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12
Q

What’s the definition for a symmetric graph with respect to the origin?

A

A graph is symmetric with respect to the origin if for every (x,y) point, the point (-x,-y) is also on the graph.

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13
Q

With respect to what is the graph of the function f(x) symmetric if f(-x) = f(x)?

A

To the y-axis.

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14
Q

Using the equation of a function, how do we test if a function is symmetric with respect to the y-axis? Use f(x) = x^2 for your explanation.

A

Replace x with -x in the equation, if the new equation is equivalent, then the function’s graph is symmetrical in respect to the y-axis.

y = x^2,
y = (-x)^2 = x^2,
(y=x^2) = (y=(-x^2)), the function’s graph is symmetrical to the y-axis.

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15
Q

What type of symmetric graph is not a function?

A

Graph symmetric with respect to the x-axis.

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16
Q

Using the equation of a graph, how do we test if it is symmetric with respect to the origin?
Use this equation for your example: y^2 = x^2 + 2

A

We substitute x with -x and y with -y, if we get an equivalent equation, then the graph is symmetric with respect to the origin.

17
Q

How is a function called if its graph is symmetric with respect to the y-axis?

A

An even function.

18
Q

How is an even function defined? Give an example with a function that satisfies the definition.

A

The function f is an even function if f(-x) = f(x).
Example: f(x) = x^2, f(-x) = (-x)^2 = x^2, f(x) = f(-x).

19
Q

How is a function called if its graph is symmetric with respect to the origin.

A

An odd function.

20
Q

What’s the definition for an odd function? Give an example with a function that satisfies the definition.

A

The function f is odd if f(-x) = -f(x).
Example: f(x) = x^3 + x,
f(-x) = -x^3 - x,
-f(x) = -(x^3 + x), f(x) = -x^3 - x,
-f(x) = f(-x).

21
Q

Instead of using the definition for an odd function, what’s a quicker way to determine if a function is odd?

A

By looking at the function’s equation’s terms. If each term’s exponent is an odd number, then this function is odd.

22
Q

Instead of using the definition for an even function, what’s a swifter way to determine if a function is even?

A

By looking at the function’s equation’s terms. If each term’s exponent is an even number, then this function is even.

23
Q

What’s a piecewise function?

A

A function that is defined by two or more equations over a specified domain.

24
Q

What’s a “greatest integer function”?

A

A function that gives the greatest integer which is less than or equal to x.