A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

Yes i do not know how to do this. I'm going out so my respond is going to be late. Can someone explain how to do this in steps not just a list of things for me to figure out. Thanks! For y = 4x + 2x2 – x3, show how to find the value for y, when x = 2. Show your work y = 2x + 2x^2+ -x^3 y3x^-1 -x^3

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

    y=2x+2x^2 - x^3 first replace all of the x's with 2 y=2(2) +2(2)^2 - 2^3 deal with your exponents y=2(2) +2(4) - 8 multiply y= 4+8 -8 simplify y= 4

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

    Shouldn't 2(2) = 4

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

    2(2)=4 + 2(2)^2 = 8 and -2^3 = 6

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

    Not getting the second 8.

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

    ?

  6. LynFran
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    \[y=4x+2x ^{2}-x ^{3} \] is this the problem?

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

    Yeah, didn't notice i changed the 4 into a two sh*t

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

    4(2)+2(2)^2 -2^3 This right?

  9. LynFran
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    so to go about finding for y, we sub substitute the value of x...which is 2... so\[y=4(2)+2(2)^{2}-(2)^{3}\]

  10. LynFran
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    we ditribute and get \[y=8+2(4)-8\]

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

    Okay thanks i think i got it.

  12. LynFran
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    simplify more we get\[y=8+8-8\]..ok whats your answer?

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

    Alright

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

    4(2)+2(2)^2 -2^3 4(2) = 8, +2(2) =4,^2 =8, -2^3 =8, 8+8 -8

  15. LynFran
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    ok i what you to tell me what y=? ...8+8-8 can be simplify

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

    y=8

  17. LynFran
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    correct

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

    Thanks :)

  19. LynFran
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    welcome

  20. 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.