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Coolmath Algebra
Functions Lesson 5 - Domain and Range (page 5 of 6)
---- This algebra lesson explains to find the domain and range of a function by looking at the graph

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Let's look at another one:

Let's find the domain and range of this guy:

Hmm... Well, I can't THINK of any x's that can't be put into this thing... But, what about the range?

We really need to graph it.

y = -( x )^2 + 3 ... the -( x )^2 part means that it's an upside down standard parabola ... the + 3 means that the graph is shifted up three

a graph of an upside down standard parabola shifted up three ... the y guys go from 3 down

Again, the domain will be all x's (since he spreads out forever). And the range goes from 3 down...

domain

range

TRY IT:

From the graph of		, find the
domain and range.

Continued on the next page

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