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Im unsure of how to go about solving these when given a set of

Given

$f= \{(-2,4),(0,-2),(1,2),(2,3)\}$ and $g(x)= 3x-5$

Find

A) $f(-2)$

B) $(f+g)(2)$

C) $f(g(x))$

D) $f(1)-g(1-k)$

In each case I’m not sure how to calculate the $f$ values.

  • 1
    First, verify $f$ is a function. Once you have done that you will probably have recalled the way in which one looks up values for a function defined in such a manner, which is all that has to be done. Finally, part C does not make sense to me, perhaps you means g(f(x)). – 2012-10-22
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    Hint: $f(2)=3$. – 2012-10-22
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    Part C has its domain restricted to the x values of the pairs given for $f$. – 2012-10-22

2 Answers 2