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MMF - Functions
Australian Maths Methods Foundation Functions Unit
66
Mathematics
10th Grade
06/14/2013

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Term
What do curly brackets symbolize? { }
Definition
A set of something
Term
What is in the set "N"?
Definition
The natural numbers
Term
What are natural numbers?
Definition
Positive integers (not including 0)
Term
What is in the set "Z" or "J"?
Definition
All integers (positive or negative)
Term
What is in the set "Q"?
Definition
The rational numbers
Term
What are the rational numbers?
Definition
Square numbers
Term
What is in the set "R"?
Definition
The real numbers
Term
What are the real numbers?
Definition
Any and all numbers
Term
What does this ∅ symbolize?
Definition
∅ is the symbol for the null or empty set
Term
What is the symbol for infinity?
Definition

Also: ← → symbolizes that the number line goes on to infinity.
Term
What does A U B mean?
Definition
A union B
All of the things that are in A AND B
Term
What does A ∩ B mean?
Definition
A intersection B
All of the common things in A and B
Term
Which symbols are used to show that the numbers are included? (Brackets and dot.)
Definition
• [ ]
Term
Which symbols are used to show that the numbers are not included? (Brackets and dot.)
Definition
o ( )
Term
What does D stand for and how is it represented on an x and y axis?
Definition
D stands for discrete and is represented by dots
Term
What does C stand for and how is it represented on an x and y axis?
Definition
C stands for continuous and is represented by a line
Term
What is a relation?
Definition
An ordered set of pairs.
ORDER MATTERS.
Term
What is the domain of a relation?
Definition
The set of first members (or x-values of the ordered pairs).
Allowable input values.
Term
What is the range of a relation?
Definition
The set of second members (or y-values of the ordered pairs).
Legit values produced by the function from the input (or x) values.
Term
What is the domain of:
R = { (1,4),(2,7),(3,10),(4,13) } ?
Definition
The set of first members.
{1,2,3,4}
Term
What is the range of:
R = { (1,4),(2,7),(3,10),(4,13) } ?
Definition
The set of second members.
{4,7,10,13}
Term
What is a function?
Definition
A function is a relation where each x-value can produce only one y-value.
Term
What does ∈ mean?
Definition
"Is an element of."
eg. A ∈ Al means:
A is an element of the set Alphabet.
Term
What does ∉ mean?
Definition
"Is not an element of."
eg. B ∉ V means:
B is not an element of the set Vowels.
Term
What does ⊂ mean?
Definition
"Is a subset of."
eg. V ⊂ Al means:
The set of Vowels is a subset of the set of Alphabet.
Term
What does \ mean?
Definition
"Excluding."
eg. A \ B means:
All that is in set A excluding what is in set B.
Term
What does ⊄ mean?
Definition
"Is not a subset (or is not contained in)."
eg. R ⊄ Al means:
The set of Real numbers is not a subset of the Alphabet.
Term
What to forms can linear functions be in?
Definition
General and slope-intercept form
Term
What is slope-intercept form? (Linear function)
Definition
A linear function arranged:
y = mx + c
(m = gradient, c = y-intercept)
Term
What is general form of a linear function?
Definition
A linear function arranged:
ax + by + c = 0
Term
Which pronumeral usually stands for gradient?
Definition
m = gradient
Term
Which pronumeral usually stand for the y-intercept? (When in slope-gradient form.)
Definition
c = y-intercept
Term
What is the gradient of a line?
Definition
The measure of its steepness or slope (m)
Term
How are gradients measured?
Definition
As we move along from left to right
Term
What does a positive gradient indicate?
Definition
That the line is rising as it goes from left to right
Term
What does a negative gradient indicate?
Definition
That the line is falling as it goes from left to right
Term
The higher the positive gradient...
Definition
.. the steeper the line
Term
The higher the negative gradient...
Definition
.. the steeper the line
Term
The larger the number of the gradient (not thinking about the + or - in front of it)...
Definition
.. the steeper the line
Term
What does a gradient of 0 indicate?
Definition
The line is horizontal or flat
Term
What does an undefined gradient indicate?
Definition
The line is vertical or up/down
Term
Formula for finding out the gradient
Definition
m = y2 - y1 / x2 - x1
Term
How do you find out the gradient of a line, when given the degree of the angle made with the line and the positive x-axis?
Definition
tan(?)
? = degree of the angle
Term
What do parallel lines have in common?
Definition
The same gradient
(They also head in the same direction)
Term
What does m1m2 equal when m1 and m2 are perpendicular slopes?
Definition
m1m2 = -1
or
m2 = -1/m1
Term
Perpendicular slopes are...
Definition
.. negative reciprocals.
Term
What do you need to know to find the equation of a line?
Definition
One point on the line (an x-value and a y-value) AND the gradient
Term
Formula for finding the gradient of a line
Definition
y - y1 = m(x - x1)
(Where y and x = the variables
y1 = the y-value of the point that is known
x1 = the x-value of the point that is known
m = gradient)
Term
What is general form of a quadratic function?
Definition
y = ax^2 + bx + c
(a ≠ 0)
Term
What is turning point form of a quadratic function?
Definition
y = a(x - h)^2 + k
(a ≠ 0)
Term
What is the curvy bit or graphed line of a quadratic function called?
Definition
Parabola
Term
Which six features must be considered when sketching parabolas (quadratic functions)?
Definition
1. y-intercept
2. x-intercept (if there is one)
3. Axis of symmetry
4. Turning point
5. Concavity
6. Range
Term
How do you find the y-intercept when sketching a quadratic function?
Definition
Substitute in x = 0 and solve for y
Term
How do you find the y-intercepts when sketching a quadratic formula?
Definition
Substitute in y = 0 and solve for x
Solving for x can be done by factorising, using the quadratic formula, or completing the square
Term
What is the axis of symmetry in a quadratic equation graph?
Definition
A line which acts to "mirror" the two halves of the parabola
Term
Which pronumeral stands for the axis of symmetry in a quadratic equation graph when the equation is in turning point form?
Definition
x = h
(x is the axis of symmetry)
Term
Which pronumeral stands for the axis of symmetry in a quadratic equation graph when the equation is in general form?
Definition
x = -b/2a
(x is the axis of symmetry)
Term
Which pronumerals stand for the turning point in quadratic functions (from turning point form)?
Definition
(h, k)
Term
How do you convert quadratic functions from general form to turning point form?
Definition
Complete the square
Term
How do you tell if the parabola goes upwards or downwards in a quadratic function?
Definition
If the coeffecient of x is positive, the parabola goes upwards
If the coeffecient of x is negative, the parabola goes downwards
Term
What is the range of an upwards concave quadratic function?
Definition
[k,∞)
(k, as in the k from turning point form and the range (y-value) of the turning point)
Term
What is the range of a downwards concave quadratic function?
Definition
(-∞, k]
(k, as in the k from turning point form and the range (y-value) of the turning point)
Term
What does b indicate when a quadratic function is in general form?
(ax^2 + bx + c = y)
Definition
The gradient of the line at the y-intercept
Term
What does c indicate when a quadratic function is in general form?
(ax^2 + bx + c = y)
Definition
The y-intercept
Term
What does a indicate when a quadratic function is in general form?
(ax^2 + bx + c = y)
Definition
Whether the parabola is concave up (smiley) or down (frowny).
If a>0, the parabola is a smiley.
If a<0, the parabola is a frowny.
Term
What does the discriminant (b^2 - 4ac) tell us when a quadratic function is in general form?(ax^2 + bx + c = y)
Definition
How many x-intercepts there are.
If ∆>0, two x-ints.
If ∆=0, one x-int (a bounce).
If ∆<0, no x-ints.
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