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Given f(x)=-2[[x-1.8]], what is f(-12)?
Greatest integer function
2 Answers
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- llafferLv 77 months agoFavorite Answer
If you mean a ceiling function for the greaest integer, then you have:
f(x) = -2⌈x - 1.8⌉
Set x = -12 to get:
f(-12) = -2⌈-12 - 1.8⌉
f(-12) = -2⌈-13.8⌉
You want the lowest integer that is greater than -13.8 to replace what's inside my ceiling function. That is -13 (-14 is less than -13.8 and would be the result if this was the floor function):
f(-12) = -2(-13)
Finally, multiply:
f(-12) = 26
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