A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

Keigh2015

  • one year ago

Choose the correct simplification of the expression (7x − 3)(4x2 − 3x − 6). 28x3 − 33x2 − 33x − 18 28x3 + 33x2 − 33x + 18 28x3 − 51x2 − 33x + 18 28x3 − 33x2 − 33x + 18

  • This Question is Closed
  1. Keigh2015
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @iGreen @brina15

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

    I'm helping you now give me two seconds.

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

    Just multiply the two expressions together.

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

    \(\sf (7x - 3) \times (4x^2 − 3x − 6)\)

  5. Keigh2015
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    28?

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

    First work with the first term, 7x * 4x^2 and you get 28x^3. Then multiply the first term of the binomial and second term of the trinomial. so 7x * -3x what do you get? @Keigh2015

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

    No, it's kind of like the last question.

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

    Multiply all the terms in the first parenthesis to all the terms in the second parenthesis.

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

    @iGreen let me help her I'm showing her an easy way.

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

    \(\sf 7x \times 4x^2\) \(\sf 7x \times -3x\) \(\sf 7x \times -6\) \(\sf -3 \times 4x^2\) \(\sf -3 \times -3x\) \(\sf -3 \times -6\)

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

    Alright @alexistheking777

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

    @Keigh2015 You see what iGreen posted? Give me the answers to the problems he posted. It is part of the equation and will help you.

  13. Keigh2015
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok hold on

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

    Yeah, after you find those just combine any like terms and you're done..

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

    Have you got your answers?

  16. Keigh2015
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    almost

  17. Keigh2015
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    In this order 28x^2 -21x -42x -12x^2 9x 18

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

    Your right for all the ones except the first two. The numbers are right but you forgot to combine the exponents so think of x^2 * x as x^2+1 since x has the exponential value of 1. So you would get an exponential value of 3. So it would be 28x^3. And same goes for x * x so it would be x^1+1 which is 2. So it should be -21x^2. 28x^3 -21x^2 -42x -12x^2 9x 18 Now combine like terms (that is terms with same exponent. So what is -21x^2 + (-12x^2)

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

    @Keigh2015

  20. Keigh2015
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    28x^3-33x^2

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

    Yes because 28x^3 is the only term with an exponential value of 3 and -21 + (-12) is like -21 - 12 which is 33. Then you replace the x and exponential value so its -33x^2. Good job, now we can eliminate answe C since the second term is 51x^2 which is wrong. So now what is -42x + 9x?

  22. Keigh2015
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    -33x

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

    By the way we can also eliminate B as well since the second term is positive and ours is negative. And yes it is -33x. Last step is to add the 18 to your equation so combine all those answers you just gave me.

  24. Keigh2015
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    28x^3-33x^2-33x+18

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

    Correct so when you look at the answers the only one that matches it is D. I hope this helped you don't forget to close this question and choose the person that was the greatest help to you by hitting best response and have a wonderful day. @Keigh2015

  26. Keigh2015
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thank you for the help and you too @alexistheking777

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

    No problem.

  28. 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.