anonymous
  • anonymous
Evaluate a-2 for a = 8. I have no clue what it is..
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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DebbieG
  • DebbieG
A variable is just a "placeholder" for a number here. So you just "plug in" the value for a into the expression, and then simplify it. I'll do a different one as an example: Evaluate z+5 for z=3 So I put in a "3" in place of the "z": 3+5=8 Got it? You try it for your problem now. :)
anonymous
  • anonymous
My options were 1/-64 1/-16 1/16 and –64 and I got none of them, I still don't get it.
amistre64
  • amistre64
then youve most likely omited the exponent ^ part

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anonymous
  • anonymous
Oh, is it -64?
amistre64
  • amistre64
no, but it does have a 64 in it
amistre64
  • amistre64
\[8^{-2}=\frac{1}{8^2}\]
anonymous
  • anonymous
it's 1/-64? right?
amistre64
  • amistre64
there would be no negative in it ... which makes me wonder about these options
amistre64
  • amistre64
i would assume thats the "most correct" option tho .. assuming that youve left out some of it in the post
anonymous
  • anonymous
oh sorry it's 1/64.. That was another option.
amistre64
  • amistre64
:) well, id go with the 1/64 then
DebbieG
  • DebbieG
lol... yeah, knowing that the -2 was a power would have been useful. :) If you don't like the equation editor, just use a ^ and ( ) as necessary: a^(-2) is unambiguous, and means something much different from a-2 :)

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