3(x+5) or 3x+15
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3(x+8)
A number tripled is a number multiplied by 3. For the variable x, x tripled would be 3x.
Ummm... I really don't know what you are trying to ask with this question so I will answer your question with variables. An unknown number tripled is 3x So you can substitute any number for x and it will be tripled. For example: if x=2, then the answer would be 6, which is tripled from 2.
X-5^2
15