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Question 702055: Hi I got a math exam review packet and don't understand this question! Please help
1. find the range of f(x)=-x+22 for the domain {-8,-6,4,7}
Found 2 solutions by RedemptiveMath, solver91311:
Answer by RedemptiveMath(80)   (Show Source):
You can put this solution on YOUR website! The domain of functions are the x-values and the range of functions are the y-values. In this case, the domain are the values for x and the range are the values for f(x). (In basic algebra, y and f(x) are allowed to mean the same.) All we need to do is find the value for f(x) given the value for x.
f(x)=-x+22
f(-8)=-(-8)+22=8+22=30
f(-6)=-(-6)+22=6+22=28
f(4)=-(4)+22=-4+22=18
f(7)=-(7)+22=-7+22=15.
Again, we can write f(x) as y and the problem may look a little less complex. Of course whatever your teacher expects trumps what I say, so be mindful and disregard anything I have said that contradicts your teacher's beliefs. Now we must write the range values in a similar manner to the domain values we are given:
Since the domain is {-8,-6,4,7}, the range is {15, 18, 28, 30}.
It is popular to write the domain and range values from least to greatest (negative to positive from left to right). You could also look at this problem as an input/output table. If x is -8, then the value we get is 30. If x is -6, then y or f(-6) is 28, and so on.
Answer by solver91311(24713)  (Show Source):
You can put this solution on YOUR website!
Take each element of the domain set and substitute it into the function in place of . Do the arithmetic in each case. Take the four results and create the range set.
John
Egw to Beta kai to Sigma
My calculator said it, I believe it, that settles it
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