anonymous
  • anonymous
If f(x) = x^2 - 1, find f(3). 5 2 8 -2
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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phi
  • phi
f(3) is short hand for : everywhere you see x, replace it with a 3 in x^2 -1 if you change the x into a 3, what do you get ?
anonymous
  • anonymous
wait why replace x with 3?
anonymous
  • anonymous
f(3)= 3x^2

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phi
  • phi
f(x) = x^2 - 1 change the x into a 3. If you do that , you can't get f(3)= 3x^2 because the x is not there.
phi
  • phi
wait why replace x with 3? Because that is what f(3) means. you start with f(x) = x^2 - 1 f(3) is "code" for replace (change) the x to a 3 if you have a pencil and paper you would write down x^2 -1, erase the x, and put a 3 in its place
anonymous
  • anonymous
f(3) = 3^2-1
phi
  • phi
yes, now do the arithmetic. remember that 3^2 is short for 3*3
anonymous
  • anonymous
f(3)= 9-1
phi
  • phi
yes, and 9-1 is ?
anonymous
  • anonymous
8 thanks i get it

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