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Thadhi67

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f(x) = 2x3- x2- (a-3)x+1 question = show that a = 5 When f is divisible in 2x - 1
 
Thadhi67 said:
f(x) = 2x3- x2- (a-3)x+1 question = show that a = 5 When f is divisible in 2x - 1
Click to expand...
Is your equation:

f(x) = 2x3- x2 - (a-3)x + 1

Have you been taught polynomial long division?

If not, consult your class-notes/Google/text-book and tell us what you found and how you can apply "your find" to this problem.
 
But I thought you guys are supposed to help me if I ask for help not to say have you tried division or do you know polynomial. I am in 10th grade and taking 11th grade math. I was stuck in this question and wondering how to do it. And all you say is do you know this ?? Seriously?
 
Very seriously. Giving you ideas as to where to look IS helping. We generally avoid the concept that doing the work for you constitutes helping.

We have no way of knowing why you are in a different math class than some of your age-peers. You must show us what you can do in order for us to be able to help you.

If you wish to control the engagement, you should consider paying for it. We're just some volunteers who would LOVE to help you. You should just answer our questions and there is close to certainty that you will gain sufficient enlightenment.

What does "is divisible by" mean?

If you are asked to simplify [math]\dfrac{6x^{2}+x-2}{2x-1}[/math], what would you do?

If you were asked if [math](x-4)[/math] is a factor of [math]5x^{3}-23x^2+10x+8[/math], what would you do?

Part of the purpose of the study of mathematics is learning to THINK, not just memorizing things or manipulating little symbols. Think about these questions. See where it goes.
 
Last edited:
Ok, but what is wrong here ?
 

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Your value for pi seems a bit off.

Is this the same problem?

Moi då.
 
Thadhi67 said:
f(x) = 2x3- x2- (a-3)x+1 question = show that a = 5 When f is divisible in 2x - 1
Click to expand...
Another way to look at it:
If f is divisible by 2x-1, it means that (2x-1) is a factor, right?
So f can be written as (2x-1) multiplied by something.
If that's the case then what is f equal to when x=1/2 ?
 
Thadhi67 said:
But I thought you guys are supposed to help me if I ask for help not to say have you tried division or do you know polynomial. I am in 10th grade and taking 11th grade math. I was stuck in this question and wondering how to do it. And all you say is do you know this ?? Seriously?
Click to expand...

It appears that you came to this site and posted a question without reading the READ BEFORE POSTING post:

READ BEFORE POSTING

Welcome to FreeMathHelp.com! Please take the time to read the following before you make your first post. It will help you to get your math questions answered promptly and in the most helpful manner. A summary is available here, but please read the complete guidelines below at your earliest...
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Among other things, this says,

Show some of your work or explain where you're stuck. Don't worry that your work might be wrong; learning is a process of making mistakes. We want to check your efforts, to see where you're at. If you show no work at all, some tutors may assume that you need links to lessons or just the first step. Other tutors might think you're looking for somebody to do your homework and might not help at all.​

It's also very helpful if you provide some information about what you are learning so we can tell what sort of help will be appropriate. (We don't even know what grade you are in unless you tell us.) Since you didn't, asking what you know how to do is exactly the right thing for us to say, as otherwise we have no idea where you need help. And mentioning polynomial division is an answer to "how to do it".

Now, if you don't know how to divide polynomials, then post #10 provides a good alternative. But you still haven't told us that.
 
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