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anonymous

  • one year ago

Find f(-2) if f(x)=-x^3+2x^2+x-1

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  1. anonymous
    • one year ago
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    just plug in the value -2 wherever you see x

  2. anonymous
    • one year ago
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    \[f(x) = -2^3 + (2*-2^2) -2 - 1\]

  3. anonymous
    • one year ago
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    just a mistake -x^3

  4. anonymous
    • one year ago
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    -13 ?

  5. anonymous
    • one year ago
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    f(-2)=-(-2)^3+2(-2)^2+(-2)-1 f(-2) = 2^3 + 2(-2)^2 -2 -1 f(-2) = 8 + 16 - 3 f(-2) = 24 - 3 f(-2) = ? subract 3 from 24 t get your answer

  6. anonymous
    • one year ago
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    let me know if something doesnt make sense

  7. anonymous
    • one year ago
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    13 was the correct answer

  8. anonymous
    • one year ago
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    yup 13

  9. anonymous
    • one year ago
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    true or false f(x)=3/x+7x^2 is a polynomial

  10. anonymous
    • one year ago
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    what do you think?

  11. anonymous
    • one year ago
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    true

  12. anonymous
    • one year ago
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    why?

  13. anonymous
    • one year ago
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    i dont know

  14. anonymous
    • one year ago
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    do you know what polynomial means?

  15. anonymous
    • one year ago
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    yes an expression of more than two algebraic terms

  16. anonymous
    • one year ago
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    yes an expression of more than two algebraic terms

  17. anonymous
    • one year ago
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    polynomial means many terms "poly" meaning "many", "nomial" means term. Those terms can consist of, constant or variables or exponents but in this equation there is a problem look down in this picture that I attached

  18. anonymous
    • one year ago
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    ok then it is false

  19. anonymous
    • one year ago
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    can you give the reasoning?

  20. anonymous
    • one year ago
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    yes becasue the dividing in the problem

  21. anonymous
    • one year ago
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    correct 3/x cannot be considered as a term so it's no longer 'poly'nomial

  22. anonymous
    • one year ago
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    State the degree:rst+r^2s^2+r^3s^2 can you help me with this

  23. anonymous
    • one year ago
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    degree in this simply means the largest exponent of a particular variable \[r^2 + s^2 + r^3s^2\]

  24. anonymous
    • one year ago
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    ok its 5

  25. anonymous
    • one year ago
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    @what!? sorry I did notice the -x^3 later, after I posted, didn't feel like re-writing it.

  26. anonymous
    • one year ago
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    no you have to state for each variable separately

  27. anonymous
    • one year ago
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    is rst considered part of the equation in this?

  28. anonymous
    • one year ago
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    yes

  29. anonymous
    • one year ago
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    alright. state the variables first then.

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