3 ms·

Bx+B2 ??? now it's getting funny!!!!!!!!

by pencil 16y ago

RiderOfGiraffes 16y ago
So going back, you need to solve: [ A(1-x+x^2)+B(x+2) ] / [ (x+2)(1-x+x^2) ] = (3x-1) / [ (x+2)(1-x+x^2) ] As I said, the denominators are already equal, so you need to make the numerators equal. That means you need to make this: A(1-x+x^2)+B(x+2) equal to (3x-1). Expand this - you already know that the second part becomes B.x+2B - and have a look. Then think - what can you set A and B to be to make it equal to 3x-1? What if you set A to be x? What if you set B to be 2? What if you set A to be -3? What if you set B to be 2x? Try those, try more, see if you can work out how you can get 3x-1. Here's a hint: when you expand you'll get one of the terms as Ax^2. How can you get that to cancel out? Try things. Tell me what you see, tell me what you get.
- pencil 16y ago
  i've started out with calculus.(it;s been 30 hours now) and i'am enjoying it as i'am able to understand.so my plan is to continue this partial fraction problem when i reach integral calculus involving partial fractions and eventually laplace transforms. and you said my algebra skills sucks.well i partialy agree with you cause i wouldn't be able to solve limits and differentiate functions without a grasp on algebra(precalculus for namesake). as a matter of fact i've never been good at anything .i suck in everything that i do.!!!!!!!!!
RiderOfGiraffes 16y ago
Just to add another question - why is that funny? A and B represent polynomials - why should this be funny to you?
- pencil 16y ago
  the fun part has got nothing to do with polynomials.i'am finding it funny cause i'am taking ages to learn this basic concept .to put in better sentence a DUMB ASS(that's me) taking advice from a knowledgeable person(that's you) by the way thanks very much for telling me that 'A' and 'B' represents polynomials.never knew it before.
  - RiderOfGiraffes 16y ago
    It's not necessarily that you're dumb - I suspect you aren't. The problem is that you're trying to get a grip on these techniques when you haven't really mastered the absolute basics of algebra. It's not surprising - you're trying to teach yourself, and it's always going to be that there are gaps. You need properly constructed tutorials and exercises. Have a look at these: http://www.google.co.uk/#q=algebra+tutorial+with+exercises http://www.google.co.uk/#q=algebra+tutorial+with+exercises Pick one of the tutorials and work through it completely. Then you can do a google search for partial fraction tutorials and do the same.
    - pencil 16y ago
      i've started out with calculus.(it;s been 30 hours now) and i'am enjoying it as i'am able to understand.so my plan is to continue this partial fraction problem when i reach integral calculus involving partial fractions and eventually laplace transforms. and you said my algebra skills sucks.well i partialy agree with you cause i wouldn't be able to solve limits and differentiate functions without a grasp on algebra(precalculus for namesake). as a matter of fact i've never been good at anything .i suck in everything that i do.!!!!!!!!! by the way i'am not offended.i'am enjoying myself with calculus.i'll get back to you if i have any doubts.if you got to say something you can.
      - deleted 16y ago
        [deleted]
      - RiderOfGiraffes 16y ago
        I didn't say your algebra skills suck - I say there are gaps. You don't put brackets where you should, and you don't seem to be able to manipulate equations quickly and easily. But you have some skills, and if you're only just starting out then you're probably doing well. I can't tell from this distance via this medium. As a final hint, here's something interesting: For a polynomial p(x), if p(a)=0 for some value a, then (x-a) is a factor of p(x). That means, for example, that (x+1) is a factor of x^3+1 and (x-1) is a factor of x^3-1. I have to go. Good luck!

Bx+B2 ??? now it's getting funny!!!!!!!!

by pencil 16y ago

Bx+B2 ??? now it's getting funny!!!!!!!!

So going back, you need to solve: [ A(1-x+x^2)+B(x+2) ] / [ (x+2)(1-x+x^2) ] = (3x-1) / [ (x+2)(1-x+x^2) ] As I said, the denominators are already equal, so you need to make the numerators equal. That means you need to make this: A(1-x+x^2)+B(x+2) equal to (3x-1). Expand this - you already know that the second part becomes B.x+2B - and have a look. Then think - what can you set A and B to be to make it equal to 3x-1? What if you set A to be x? What if you set B to be 2? What if you set A to be -3? What if you set B to be 2x? Try those, try more, see if you can work out how you can get 3x-1. Here's a hint: when you expand you'll get one of the terms as Ax^2. How can you get that to cancel out? Try things. Tell me what you see, tell me what you get.

pencil 16y ago
i've started out with calculus.(it;s been 30 hours now) and i'am enjoying it as i'am able to understand.so my plan is to continue this partial fraction problem when i reach integral calculus involving partial fractions and eventually laplace transforms. and you said my algebra skills sucks.well i partialy agree with you cause i wouldn't be able to solve limits and differentiate functions without a grasp on algebra(precalculus for namesake). as a matter of fact i've never been good at anything .i suck in everything that i do.!!!!!!!!!

RiderOfGiraffes 16y ago

Just to add another question - why is that funny? A and B represent polynomials - why should this be funny to you?

pencil 16y ago
the fun part has got nothing to do with polynomials.i'am finding it funny cause i'am taking ages to learn this basic concept .to put in better sentence a DUMB ASS(that's me) taking advice from a knowledgeable person(that's you) by the way thanks very much for telling me that 'A' and 'B' represents polynomials.never knew it before.
- RiderOfGiraffes 16y ago
  It's not necessarily that you're dumb - I suspect you aren't. The problem is that you're trying to get a grip on these techniques when you haven't really mastered the absolute basics of algebra. It's not surprising - you're trying to teach yourself, and it's always going to be that there are gaps. You need properly constructed tutorials and exercises. Have a look at these: http://www.google.co.uk/#q=algebra+tutorial+with+exercises http://www.google.co.uk/#q=algebra+tutorial+with+exercises Pick one of the tutorials and work through it completely. Then you can do a google search for partial fraction tutorials and do the same.
  - pencil 16y ago
    i've started out with calculus.(it;s been 30 hours now) and i'am enjoying it as i'am able to understand.so my plan is to continue this partial fraction problem when i reach integral calculus involving partial fractions and eventually laplace transforms. and you said my algebra skills sucks.well i partialy agree with you cause i wouldn't be able to solve limits and differentiate functions without a grasp on algebra(precalculus for namesake). as a matter of fact i've never been good at anything .i suck in everything that i do.!!!!!!!!! by the way i'am not offended.i'am enjoying myself with calculus.i'll get back to you if i have any doubts.if you got to say something you can.
    - deleted 16y ago
      [deleted]
    - RiderOfGiraffes 16y ago
      I didn't say your algebra skills suck - I say there are gaps. You don't put brackets where you should, and you don't seem to be able to manipulate equations quickly and easily. But you have some skills, and if you're only just starting out then you're probably doing well. I can't tell from this distance via this medium. As a final hint, here's something interesting: For a polynomial p(x), if p(a)=0 for some value a, then (x-a) is a factor of p(x). That means, for example, that (x+1) is a factor of x^3+1 and (x-1) is a factor of x^3-1. I have to go. Good luck!