A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
Find the remainder when f(x) = −2x3 + 24x2 − 58x + 40 is divided by x − 9.
anonymous
 one year ago
Find the remainder when f(x) = −2x3 + 24x2 − 58x + 40 is divided by x − 9.

This Question is Closed

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I attempted to do this problem using the Remainder Theorem and came up with an incorrect answer. Please show work so I can better understand why I got the problem wrong.

freckles
 one year ago
Best ResponseYou've already chosen the best response.1the remainder theorem says we can just evaluate f(9)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Exactly! I inputted that value, but I came up with an incorrect answer. Did I make an arithmetic error?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I came up with 396 when evaluating the function for the value of 9.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@freckles is there anyway you could evaluate the function, for f(9), and see what you come up with?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Thanks for your previous help with the concepts of the Theorems as well, it really helped!

freckles
 one year ago
Best ResponseYou've already chosen the best response.1\[f(9)=2(9)^3+24(9)^258(9)+40 \\ f(9)=2(729)+24(81)58(9)+40 \\ f(9)=1458+1944522+50 \\ f(9)=486522+50 \\ f(9)=522+486+50 \\ f(9)=522+536 \\ f(9)=536522=14\] is this what you did ? I did it without a calculator so you might want to check

freckles
 one year ago
Best ResponseYou've already chosen the best response.1oops I put 50 instead of 40

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I see my egregious error quite clearly now. For some reason my calculator came up with 261 instead of 729 for 9^3, I must've inputted it incorrectly.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0By subtracting 10 from the final output, your answer is correct. Thanks again for all your help!

freckles
 one year ago
Best ResponseYou've already chosen the best response.1yeah I accidentally put 50 on that 3rd line and kept it as 50 that is why my answer was 10 units more than what it should have been
Ask your own question
Sign UpFind 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
 Engagement 19 Mad Hatter
 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.