Quantcast

A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

d_poole

  • 2 years ago

x(7 – x) > 8 A. 2 B. 8 C. –1 D. 0

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

    Start by distributing that x. x(7 -x) > 8 7x + x^2 > 8 x^2 + 7x -8 > 0 (x+8)(x-1) > 0 x = -8 x = 1

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

    Then substitute each back into the original equation, and see which one is true.

  3. Rosy95
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    For a problem like this, that you don't know how to solve, it is best to just pluge in the answers. A 2= 10>8 B 8= -8>8 C -1= -8>8 D 0= 0>8 So there is only one true statement there and it is a

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

    where did the 10 come from?

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

    @Rosy95: there will be an occasion when there are no answers... Therefore, it is always better to learn how to do such a problem (see @blurbendy's method), so next time you'll know what to do.

  6. Rosy95
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    10 is what you get on that side when you sub the 2 in for the x's. x(7-x)>8 2(7-2)>8 14-4>8 10>8 @ZeHanz yes I know that, however I was just saying that when it comes down to a test you cant just look it up, therefore when they give you answer choice, plug it in

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

    @Rosy95 thanks

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

    @Rosy95: Am I right in thinking that a lot of people asking questions here do multiple choice questions all the time?

  9. Rosy95
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Yes, and on math test it is a lot of mult choice questions, so if you are not getting something, plug it in and your welcome @d_poole

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

    That explains a lot. I'm from Holland, and many high school students never see even one multiple choice question at maths.

  11. Rosy95
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Oh ok. Well to give you an example. I had a 40 question math test and only 3-5 were NOT multipul choice, so even if you miss the written ones, you will still pass.

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

    Advantage for the teacher: quick grading, although less rewarding if students are just trying some numbers, probably using a calculator...

  13. Rosy95
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    yes that is all true lol...and I am actually a tutor in algebra currently so I know how do these problems, but because someone had already explained how to do this problem, i was giving d_poole another option

  14. Rosy95
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    but @ZeHanz if you are good at precal or math in general can you help me with my question..here is the link to it on here http://openstudy.com/study#/updates/50f5c9aee4b061aa9f9ad656

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

    I'going to sleep now...sorry, but glad to help you soon! Bye.

  16. Rosy95
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Ok. Thanks night!

  17. 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.