# Homework Help: Componendo and Dividendo

1. Oct 13, 2011

### physics kiddy

x3+3x/3x2+1 = 341/91

2. Oct 13, 2011

### SammyS

Staff Emeritus
Do you mean: (x3+3x)/(3x2+1) = 341/91 ?

Parentheses are important.

3. Oct 13, 2011

### physics kiddy

yes.

4. Oct 13, 2011

### SteamKing

Staff Emeritus
Did you try applying the rules of algebra?

5. Oct 13, 2011

### physics kiddy

no, i must use either componendo and dividendo or k-method. No algebra at all.

6. Oct 13, 2011

### Staff: Mentor

I doubt that many of us here even know what "componendo and dividendo" mean or what "k-method" means.

The first two are apparently Spanish or maybe Portuguese for combining and dividing.

7. Oct 13, 2011

### symbolipoint

physics kiddy,
Are you trying to solve for x, or are you substituting a value for x in order to evaluate the rational expression?

8. Oct 13, 2011

### sankalpmittal

Hiii physics kiddy !

Try applying componendo and dividendo once more. I will guide you.

k-method cannot work here because there are no proportional relation given.
If there are relations like a,b,c and d are in continued proportion , then k-method can be applied.

You can even try cross-multiplying.

9. Oct 13, 2011

### physics kiddy

Please solve this question. I am tired of using componendo and dividendo but all my efforts go useless. I can't go any further. It would be very kind of you if you solve the question. Thanks again for the help.

10. Oct 13, 2011

### Mentallic

You need to show an attempt at the problem. Show us what you've tried.

11. Oct 13, 2011

### HallsofIvy

We don't dislike you enough to want to prevent you from learning! I am closing this thread. If you really want help, start a new thread showing what you have done.