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“Building Blocks, Building Functions”
f(x) = 2x -
1
g(x) =
g(x) =
f(x) =
g(x) =
f(x) =
|x +
3|
g(x) = 3 -
xf(x) =
f(x) =
g(x) = 9 -
g(x) =
f(x) =
g(x) =
f(x) =
f(x) = 2
g(x) = (x
-
1
f(x) =
3x +
2
g(x) =
g(x) =
g(x) = f(x) = + 4
http://www.youtube.com/watch?v=9rsJF6lqxaoCopy and Paste into Internet Explorer
Combining Functions
A way of creating new functions to combine two or more functions to create a new function. The most obvious way we can do this is to
perform basic algebraic operations on the two functions to create the new one
Add, subtract, multiply or divide functions. The algebra of real numbers: 4 x 5 = 20,
4 - 5 = -1 The algebra of functions: fg, f-g, etc
Relations and Implicitly Defined Functions
Relation: A set of ordered pairs of real numbers
- If the relation happens to relate a single value of y to each value of x, then the relation is also a function and its graph will pass the vertical line test
Implicitly defined function: A function that is a subset of a relation defined by an equation in x and y
Example - Relation
Determine which of the ordered pairs (2,-5), (1,3), and (2,1) are in the relation defined by + . Is this relation a function?
(2,-5): (2(5) + (-5 = 5(1,3): (1(3) + (3 = 12 = 5(2,1): (2(1) + (1 = 5So, (2,-5) and (2,1) are in the relation, but (1,3) is not. Since the equation relates two different y-values (-5 and 1) to the same x-value (2), the relation cannot be a function.
Example - Implicitly
The graph consists of two parallel lines, each the graph of one of the implicitly defined functions
Materials Used
Pre-Calculus Book http://facultypages.morris.umn.edu/~
mcquarrb/teachingarchive/Precalculus/Lectures/BuildingFunctionfromFunctions.pdf
http://math.ucsd.edu/~wgarner/math4c/textbook/chapter2/combfunctions.htm
Jeopardy Game: https://jeopardylabs.com/