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Unit 5: Intro to functions
What is a function?
: Functions assign a single unique output for each of their inputs. In this video, Sal gives many examples of various kinds of functions.
Graphs of absolute value functions
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How to graph a piecewise function (example)
: Sal graphs a piecewise function given its formula. In this case, the function consists of three separate lines.
Finding a piecewise function definition from graph
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How to combine functions by adding them (example)
: Sal solves the following problem: given that f(x)=9-x^2 and g(x)=5x^2+2x+1, find (f+g)(x). He explains that generally, (f+g)(x)=f(x)+g(x).