Noah00
Badges: 5
Rep:
?
#1
Report Thread starter 4 weeks ago
#1
When x^3+4x^2+kx+6 is divided by (x+5) the remainder is -4. What is k. I was doing polynomials today and got stuck on this question, what would I do to solve it? Would I use the factor/remainder theorem?
Thanks
0
reply
duckduck..goose
Badges: 3
Rep:
?
#2
Report 4 weeks ago
#2
Name:  IMG_1513.JPG
Views: 31
Size:  56.7 KB
hope this helps : )
0
reply
duckduck..goose
Badges: 3
Rep:
?
#3
Report 4 weeks ago
#3
(Original post by duckduck..goose)
Name:  IMG_1513.JPG
Views: 31
Size:  56.7 KB
hope this helps : )
whoops! thought the remainder was equal to 4. if its -4 then it should be -5k = 15, and k = -3.
0
reply
ghostwalker
  • Study Helper
Badges: 17
#4
Report 4 weeks ago
#4
(Original post by Noah00)
When x^3+4x^2+kx+6 is divided by (x+5) the remainder is -4. What is k. I was doing polynomials today and got stuck on this question, what would I do to solve it? Would I use the factor/remainder theorem?
Thanks
You'd have been better to post in the maths forum, rather than this umbrella forum which is no where near as heavily frequented.

In answer to your question, yes, the remainder theorem.

If we call your polynomial f(x), then you have f(-5) = -4. Just plug in the numbers and solve for k.
0
reply
.unknown
Badges: 17
Rep:
?
#5
Report 3 weeks ago
#5
(Original post by duckduck..goose)
whoops! thought the remainder was equal to 4. if its -4 then it should be -5k = 15, and k = -3.
K is 3 not -3
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • University of Hertfordshire
    All Subjects Undergraduate
    Sat, 22 Feb '20
  • Ravensbourne University London
    Undergraduate Open Day Undergraduate
    Sat, 22 Feb '20
  • Sheffield Hallam University
    Get into Teaching in South Yorkshire Undergraduate
    Wed, 26 Feb '20

People at uni: do initiations (like heavy drinking) put you off joining sports societies?

Yes (409)
67.6%
No (196)
32.4%

Watched Threads

View All