A community for students.
Here's the question you clicked on:
 0 viewing
 2 years ago
The graph of f(x) = ax^4 + bx^2 + cx24 crosses the xaxis at 1, 2, and 3. determine the equation of f(x).
 2 years ago
The graph of f(x) = ax^4 + bx^2 + cx24 crosses the xaxis at 1, 2, and 3. determine the equation of f(x).

This Question is Closed

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1start with \[(x1)(x+2)(x3)(xr)\] and see if you can solve for \(r\)

sabika13
 2 years ago
Best ResponseYou've already chosen the best response.0do i expand and then solve?

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1no you don't really have to expand yet, you can visualize what the constant should be the constant will be \(6r\) so you know \(6r=24\) and if you are lucky \(r=4\) works

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1oh damn it doesn't because you get a cube term and your polynomial doesn't seem to have one

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1on the other hand something is wrong, because you have a 4th degree polynomial. it has 4 zeros total, although either two or four could be complex. however, if it crosses the \(x\) axis 3 times it must cross it a fourth. if one root is repeated, then it does not cross the axis but only touches it. so i am stumped

sabika13
 2 years ago
Best ResponseYou've already chosen the best response.0maybe one passes through origin?

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1then it still has 4 zeros one would be zero, and also it could not end in \(24\)

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1it really starts with \(ax^4\) right?

sabika13
 2 years ago
Best ResponseYou've already chosen the best response.0i have the answer if that helps?

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1ok i am very certain that a fourth degree polynomial cannot cross the \(x\) axis only 3 times

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1sure go ahead and let me see why i am wrong

sabika13
 2 years ago
Best ResponseYou've already chosen the best response.0its f(x)= 4x^3 + 8x^2 + 20 x 20

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1we could perhaps start with \[a(x1)(x+2)(x3)(xr)\] and see if we can solve for the coefficients, but it must cross 4 times

sabika13
 2 years ago
Best ResponseYou've already chosen the best response.0f(x)= 4x^3 + 8x^2 + 20 x 24 *** sorrry

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1hold the phone, it is cubic?

sabika13
 2 years ago
Best ResponseYou've already chosen the best response.0the answers a cubic :S

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1i thought it was a 4th degree polynomial, since you wrote \[f(x) = ax^4 + bx^2 + cx24\]

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1if it is \[f(x) = ax^3 + bx^2 + cx24\] then that is a whole different story

sabika13
 2 years ago
Best ResponseYou've already chosen the best response.0lol thats what the question says, its ax^4 + bx^2 ..

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1and much simpler write \[a(x1)(x3)(x+2)= ax^3 + bx^2 + cx24\] and solve

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1then there is something wrong with the question, it is a typo

sabika13
 2 years ago
Best ResponseYou've already chosen the best response.0so if its ax^3 will the answer be right?

satellite73
 2 years ago
Best ResponseYou've already chosen the best response.1your question asks for a 4th degree polynomial, which must have 4 zeros. it also has no cube term your answer has a third degree polynomial, so there is a mistake in the question

sabika13
 2 years ago
Best ResponseYou've already chosen the best response.0yeah it prob is a typo.. ah been trying to question for so long.. thanks tho!
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.