A community for students.
Here's the question you clicked on:
 0 viewing
DeadShot
 3 years ago
Determine the zeros of f(x) = x4  x3 + 7x2  9x  18.
DeadShot
 3 years ago
Determine the zeros of f(x) = x4  x3 + 7x2  9x  18.

This Question is Closed

shubhamsrg
 3 years ago
Best ResponseYou've already chosen the best response.0Got it, break 7 as 92 /

DeadShot
 3 years ago
Best ResponseYou've already chosen the best response.0so \[\pm 1\] is the answer?

shubhamsrg
 3 years ago
Best ResponseYou've already chosen the best response.0What do get after writing 7 as 92 ?

DeadShot
 3 years ago
Best ResponseYou've already chosen the best response.0\[x^4  x^3 + 9  2x^2  9x 18\] ?

shubhamsrg
 3 years ago
Best ResponseYou've already chosen the best response.0x^4  x^3 + 9x^2 2x^2  9x  18.=0 =>(x^4 + 9x^2)  (x^3 9x) (2x^2 18) =0 You see what should be the next step ?

DeadShot
 3 years ago
Best ResponseYou've already chosen the best response.0yeah, factor each binomial, right?

DeadShot
 3 years ago
Best ResponseYou've already chosen the best response.0(x^2 + 1) (x^2 + 9) for the first one?

amoodarya
 3 years ago
Best ResponseYou've already chosen the best response.0x1 = 2 x2 = 1 x3 = 0 + 3i x4 = 0  3i

DeadShot
 3 years ago
Best ResponseYou've already chosen the best response.0So, substitute (0  3i) and 1 for x^2, making it ((0  3i) + 9(1))?

DeadShot
 3 years ago
Best ResponseYou've already chosen the best response.0so, then it would become (3i  9)

amoodarya
 3 years ago
Best ResponseYou've already chosen the best response.0hint : divide f(x) to x^2+9 you would find your answer!

DeadShot
 3 years ago
Best ResponseYou've already chosen the best response.0So, divide x^4  x^3 + 7x^2  9x  18 by x^2 + 9 ?

DeadShot
 3 years ago
Best ResponseYou've already chosen the best response.0so it would be x^2  x + 7  x  2 ?

DeadShot
 3 years ago
Best ResponseYou've already chosen the best response.0combine like terms, and it would be x^2  2x + 5 , right?

zordoloom
 3 years ago
Best ResponseYou've already chosen the best response.1Hmm.. Looks like you have 2 real zeros and 2 imaginary.

zordoloom
 3 years ago
Best ResponseYou've already chosen the best response.1Do you still need help?

DeadShot
 3 years ago
Best ResponseYou've already chosen the best response.0yes, I don't know what to do next
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.