A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • 5 years ago

Find the difference and enter it in the box below. (3x7 + 6x4 - 5x + 7) - (6x4 - 5x3 + 7) can someone plz take a look at this one i tried and i cant get an answer for it

  • This Question is Closed
  1. anonymous
    • 5 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    (3x^7 + 6x^4 - 5x + 7) - (6x^4 - 5x^3 + 7) sorry the problwm should look like this

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

    can someone please help me i couldn"t get an answer for it

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

    ok so first you should distribute the negative on the second parenthesis you end up with 3x^7 + 6x^4 -5x + 7 - 6x^4 +5x^3 -7 some terms cancel from addition and subtraction and so simplify 3x^7 + 5x^3 - 5x

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

    ok thank you i first added the xs together to get 9x^11

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

    oh no you cant do that

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

    they are exponents...you cant add them unless they have the same base

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

    correction: you cant add them unless they are multiplied or divided by each other with the same base

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

    oh yea sorry i forgot

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

    so walk me throught it please

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

    ok so you have two sets of parenthesis and the second one is all subtracted from the first one so what you do is since the entire thing is subtracted, you can get rid of the parenthesis through distribution of the minus sign, so you multiply each term by -1 in the second parenthesis then you end up with 3x^5 + 6x^4 - 5x + 7 -6x^4 + 5x^3 - 7 and so now look at terms that have the same exponent. look at x^4, you are adding 6x^4 and you are subtracting 6x^4 and so if you add and subtract the same thing, its like adding zero, so they cancel each other. then you also have some constants doing the same thing so the 7's will cancel. cleaning up what we now have is 3x^7 + 5x^3 - 5x now look at the exponents. you have a degree of 7, 3, and 1. since none are equal, you cannot combine further. therefore you are left with exactly that.

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

    i think i got it ill try the next one

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

    Which polynomial represents the difference below? 10x^8 + 11x^6 - 2x + 5 - (8x^8 + 6x^7 - 5) A. 2x^8 - 6x^7 + 11x^6 - 2x + 10 B. 18x^8 -17x^7 + x6 - 2x + 10 C. 2x^0 + 5x^1 - 2x D. 2x^8 - 6x^7 + 9x^6 - x + 10

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

    ok here is one i cannot get

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

    is the answer b

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

    ok so its kind of the same thing we just did distribute the negative 10x^8 + 11x^6 - 2x + 5 - 8x^8 - 6x^7 + 5 notice you have terms with x^8 so you can subtract the coefficients 10 - 8 = 2 then look at the constants. you have a +5 and a + 5 so you have 10. they dont cancel this time! so you are left with 2x^8 - 6x^7 +11x^6 -2x + 10 so the answer is A

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

    :) ok i get it now

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

    ok i hope it helped...if you didnt understand i can try to explain again

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

    no i did thank you for your help

  19. 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

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.