Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

kelsey1

  • 2 years ago

f(x)=-x^2+5x+7 Find f(3a-4)

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

    so wat am pose to be doing?

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

    substitute 3a-4 to all the x in the equation

  3. kelsey1
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes I know, but I'm not sure how to do that like can you show me the steps

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

    f(x)=-x^2+5x+7 f(3a-4) = -(3a-4)^2 + 5(3a -4) + 7 Simplify the expression

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

    |dw:1354855276611:dw| For the first term

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

    Bro, the first term is negative

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

    However there is a negative sign in fron of x so you have to multiply the first term with negative one.

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

    Hero buddy, patience... lol

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

    But anyway, the difficult part is done. Let the person finish it themselves.

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

    I assume you'll have the idea to do the next ones from here on?

  11. kelsey1
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I know how to do foil and all the math yet are you solving for x or leaving it as a quadratic?

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

    Nothing nowhere says to solve for x. In fact, when I posted the hint I gave you. I left a comment below saying to "simplify the expression". How did you interpret "solve for x" from that?

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

    x becomes a, so x is out of the picture. if your asked to simplify the expression then I guess all you have to do is the equation hero did setup for you.

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

    you're*

  15. kelsey1
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Well I meant "a" and my problem was that I thought I was solving for "a".

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

    then I guess you're all set :)

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

    @kelsey1, will you please just simplify the expression and let us know what you get?

  18. kelsey1
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    9a^2-9a+3

  19. 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.