Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

Hollywood_chrissy

  • 2 years ago

(a^3+b^3)=(a+b)(a^2-ab+b^2) my question is why the -ab?

  • This Question is Closed
  1. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Are you asking why the term "-ab" is in the middle of the formula?

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

    Yes

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

    And not a positive ab

  4. Venomblast
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    it cant be ab because the 1st term "a^2" does not have a "b". you can only take out if all the term got something in common.

  5. Venomblast
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    it already factor in lowest term

  6. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @Hollywood_chrissy Maybe it would help you see it to multiply out the stuff on the right side of the equation. You end up with (a^2)(b) and (a)(b^2) terms, and by having "-ab", the signs on those terms alternate and ultimately all cancel out, leaving only the cubed terms. It is similar to when you factor a difference of squares... a^2 - b^2 = (a+b)(a-b) <<-- the signs in the factored version cause the unwanted terms like "ab" to cancel out, leaving only the squared terms.

  7. Hollywood_chrissy
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Yeah, i just noticed that too.

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

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.