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zhengcl86 Group Title

determine the domain of \[f(x)=\sqrt{9-x ^{2}}\]

  • one year ago
  • one year ago

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  1. henryrodriguez713 Group Title
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    What's your question? haha

    • one year ago
  2. zhengcl86 Group Title
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    determine the domain \[f(x)=\sqrt{9-x ^{2}}\]

    • one year ago
  3. baldymcgee6 Group Title
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    Do you know what the question is asking for? i.e. do you know what the domain of a function is?

    • one year ago
  4. zhengcl86 Group Title
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    the question just says determine the domain of \[f(x)=\sqrt{9-x ^{2}}\]

    • one year ago
  5. baldymcgee6 Group Title
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    Yes I know. But do YOU know what it means? What is the "domain"

    • one year ago
  6. zhengcl86 Group Title
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    oh lol isnt it a set of functions with all possible inputs from neg to pos or infinite?

    • one year ago
  7. zhengcl86 Group Title
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    wouldn't i be breaking down the square root of 9 - x squared (3-x)(3+x)

    • one year ago
  8. baldymcgee6 Group Title
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    It is all the values of x that you could put into your function to get an output value. So a better question would be to ask yourself what values of x can I put into the function that makes it DNE

    • one year ago
  9. zhengcl86 Group Title
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    what does DNE mean?

    • one year ago
  10. henryrodriguez713 Group Title
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    |dw:1358900569521:dw||dw:1358900892255:dw|

    • one year ago
  11. baldymcgee6 Group Title
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    DNE is 'does not exist' i.e refers to a part on the functions graph that cannot be determined, because it simply does not exist. :) Basically you need to watch out for square roots, logarithms and denominators equalling zero. In your case, you have a square root, and as @henryrodriguez713 pointed out, you CANNOT have a negative number under the square root.

    • one year ago
  12. zhengcl86 Group Title
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    |dw:1358901287263:dw|

    • one year ago
  13. baldymcgee6 Group Title
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    To get rid of the square root, simply square both sides of the equation.

    • one year ago
  14. zhengcl86 Group Title
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    oh since i can't have a negative number, the answer would be false correct? its been 3 years since i've been in school xD

    • one year ago
  15. baldymcgee6 Group Title
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    The function does not exist for x values less than -3 and more than 3

    • one year ago
  16. baldymcgee6 Group Title
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    |dw:1358901513506:dw|

    • one year ago
  17. henryrodriguez713 Group Title
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    Haha. Don't worry if you haven't been in school for three years. All that really matters is that you're learning it. :D

    • one year ago
  18. zhengcl86 Group Title
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    |dw:1358901727152:dw|

    • one year ago
  19. zhengcl86 Group Title
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    would this be the final product answer?

    • one year ago
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