Advanced Functions Midterm
Unit One - Functions Review
Lesson One - Factoring
There are 4 types of factoring
- Simple Trinomial (adds to multiplies to)
- Difference of squares ( 9x^2-4)
- Complex Trinomial (criss cross, Australian and, Decomposition)
- Greatest common factoring
Lesson Two - Familiar Functions
A relation is: a relationship between two or more variables
A function is: a relation where each x value only has one y value
A relation is a function if it passes the vertical line test
Lesson Three - Transformations |
y= af(b(x-c)) + d
A: if -ve reflect of the x axis, vertical stretch by a factor of a (a > 1), vertical compression by 1/a (0<a<1)
B: Horizontal stretch by a factor of 1/b (0
C: horizontal shift right “c” units (-), horizontal shift left “c” units (+)
D: Vertical shift up “d” units (+), vertical shift down “d” units (-)
Lesson Five - Inverse Functions
To find the inverse of a function algebraically:
- Switch the x and y in the equation
- Solve for the new y
- Rename y to be the inverse of the original function given
Find the inverse of a function graphically
- switch the x and y coordinates of each point on the graph. the inverse will be a reflection of the original function off the line y=x
- Invariant points are the points that did not change
- The inverse of a function is not necessarily a function
Unit Two - Polynomials |
Lesson One - Intro to Polynomial Functions
A polynomial function is a function that can be expressed in the form: f(x)=ax^n+bx^n−1+cx^n−2+…+dx^3+ex^2+fx+g
N is the degree of the function, and must be a whole number
X is a variable
A, B, C, D are all coefficients
A is the leading coefficient
Specific degrees
- 0 = constant
- 1 = linear
- 2 = quadratic
- 3 = cubic
- 4 = quartic
- 5= quintic
Symmetry
Line (even) - You can divide the graph into two equal parts along the y-axis
Point (odd) - The graph can rotate 180 and the graph will stay the same
Even and Odd degree Functions
Even and positive - Start high, end high
Even and negative - start low, end low
Odd and positive - start low, end high
Odd and negative - start high, end low
Lesson Three - Factored form of Polynomial Functions
Orders:
- 1 - straight through
- 2 - bounce
- 3 - squiggle
Symmetry
Even degree functions are not necessarily even functions
Odd degree functions are not necessarily odd functions
An even function is symmetric about the y-axis. f(-x) = f(x)
A function that is odd is symmetric about the origin. f(-x) = -f(x)
Lesson Five - Slope of Secant vs. Tangent
The secant is a line that crosses a curve at two points
the tangent is a line that touches a curve at one point
Slope of a secant = average rate of change (ARC)
sloe of a tangent = instantaneous rate of change (IRC)
Lesson Six - Instantaneous rates of change
Three ways to determine the IRC
- Graphing: graph the function, draw the tangent estimate 2 points on the line, find the slope.
- Substituting: use the given x1 and y1 then sub in a value that is extremely close to the two values, use the slop formula, do not round
- Algebraically: use the first principles formula
Unit Three - Polynomials ||
Lesson One - Remainder Theorem
If the remainder is 0, this means that the divisor is a factor of the dividend
if the remainder is not zero, the divisor is not a factor of the dividend
Lesson Four - Family of Polynomial Functions
Family of functions = a set of functions that have the same characteristics (same x-intercepts but different y-intercepts
when making an equation add on, KER, K can’t = 0
Lesson Five - Solving Inequalities Graphically
On a number line:
Closed dot = right on the number
Open dot = doesn’t hit the number
Unit Four - Rationals
Lesson One - Introduction to Rational Functions
The reciprocal of a function is: 1/the function
Invariant points: where f(x)= +/-1
Local max/min: Wherever f(x) has one, g(x) will too)
Lesson Two - Limits
We say that the limit of a function f(x), as x approaches a point a, is equal to a number (call is L). If f(x) can be made as close to L as desired by making x sufficiently close to a, but not equal to a. If there is no such number we say that the limit does not exist
Lesson Three - Vertical and Horizontal Asymptotes
Vertical Asymptotes:
- Occur where a function is undefined (denominator is equal to zero)
- To find them, factor the denominator then set each factor to zero and solve
Horizontal Asymptotes
- Can be cross the HA somewhere in the graph
- degree in numerator = degree in the denominator, LCn/LCd
- degree in numerator < degree in the denominator HA = 0
- degree in numerator > degree in the denominator HA = oblique (found through long division)
Lesson Six - Instantaneous and Average Rates of Change
The formulas can be used for rational functions; however, the interval must not include where the function is undefined