Question 558328: What are the domain and range of the relation {(2, 2), (4, 2), (6, 2)}? Is the relation a function? Choose yes or no.
Given f(x) = x2 – 2x, find f(4).
Answer by Edwin McCravy(20060)   (Show Source):
You can put this solution on YOUR website! What are the domain and range of the relation {(2, 2), (4, 2), (6, 2)}? Is the
The set of first coordinates is {2,4,6}, that its domain
The set of second coordinates is {2}, that its range.
relation a function? Choose yes or no.
The first coordinates are all different, so it's a function.
(It doesn't matter that the second coordinates are not different).
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Given f(x) = x² – 2x, find f(4).
Substitute 4 for x
f(x) = x² – 2x
f(4) = 4² – 2·4
f(4) = 16 – 8
f(4) = 8
Edwin
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