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Nicolas Porter
Mathematics
28 September, 10:45
What is the range of f (x) = 3x + 9?
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Maci Preston
28 September, 10:53
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Answer: - 21, - 18, - 9, - 6, 15
Explanation:
The range is all the values the function can achieve by using x in from its domain, so we just plug in all the numbers in the domain here;
f (-4) = 3 (-4) - 9 = - 12 - 9 = - 21
f (-3) = 3 (-3) - 9 = - 9 - 9 = - 18
f (0) = 3 (0) - 9 = 0 - 9 = - 9
f (1) = 3 (1) - 9 = 3 - 9 = - 6
f (8) = 3 (8) - 9 = 24 - 9 = 15
So the range is the set {-21, - 18-, - 9, - 6, 15}
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