Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

frx

  • 3 years ago

Show that if r is a positive odd integer then the polynomial \[x ^{r}+1\] is dividable by \[x+1\]

  • This Question is Closed
  1. sauravshakya
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Let f(x)=x^r +1 Now, use remainder theorem

  2. sauravshakya
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Can u?

  3. frx
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Don't know the remainder theorem :/

  4. sauravshakya
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    If a polynomial f(x) is divided by (x-a) then (x-a) is a factor of f(x) if f(a)=0.

  5. sauravshakya
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Oh sorry... it is Factor Theorem.... Now use this factor theorem.

  6. frx
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I do get the factor theorem, so that proves a part of it. I do have the answer though and it says that this it only valid if and only if (-1)^r+1=0, what's the meaning of that?

  7. sauravshakya
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    f(x)=x^r +1 Now, when f(x) id divided by (x+1) then, Remainder = f(-1)=(-1)^r+1 Since r is odd (-1)^r=-1 So, Remainder =f(-1)=-1+1=0 Thus,x^r +1 is divisible by x+1

  8. frx
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh, how stupid, I see that it's just a continuation of the factor theorm, thank you :)

  9. sauravshakya
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Welcome

  10. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy