Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
neverforgetvivistee
Group Title
How do i find the excluded value of this denominator?
r^3−r^2−49r+49
 3 years ago
 3 years ago
neverforgetvivistee Group Title
How do i find the excluded value of this denominator? r^3−r^2−49r+49
 3 years ago
 3 years ago

This Question is Closed

Kira_Yamato Group TitleBest ResponseYou've already chosen the best response.2
Let the denominator = 0
 3 years ago

neverforgetvivistee Group TitleBest ResponseYou've already chosen the best response.0
how?
 3 years ago

Kira_Yamato Group TitleBest ResponseYou've already chosen the best response.2
Solve the eqn = 0
 3 years ago

neverforgetvivistee Group TitleBest ResponseYou've already chosen the best response.0
i learned that we factor it first and equal it to zero
 3 years ago

neverforgetvivistee Group TitleBest ResponseYou've already chosen the best response.0
how do i solve it? it doesn't have a common factor
 3 years ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.0
try finding a factor using factor theorem
 3 years ago

neverforgetvivistee Group TitleBest ResponseYou've already chosen the best response.0
thanks i'll learn that go learn that i haven't learned that yet
 3 years ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.0
x7 is worth trying (as last term = 7^) f(7) = 343  49  343 + 49 = 0 ok so (x7) is a factor now find any other factors by dividing by x7
 3 years ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.0
factor theorem if f(x) is divisible by xa then f(a) = 0
 3 years ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.0
r^2 +6r  7  r7 ) r^3−r^2 −49r+49 r^3 7r^2  6r^2  49r 6r^2  42r  7r + 49
 3 years ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.0
r^2 +6r  7 = (r+7)(r1) so factors of f(r) = (r7)(r+7)(r1)
 3 years ago

cwrw238 Group TitleBest ResponseYou've already chosen the best response.0
so excluded value is value of f(r) when r=7,7 or 1
 3 years ago
See more questions >>>
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.