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## #1 2009-10-02 11:50:29

Kurtz
Member
Registered: 2007-10-01
Posts: 27

### Grouping

Is it possible to solve this problem with the grouping method? It ask to use the grouping method on this to simplify but I think it is not possible.

a²x + bx - a²z - bx

I am a mathemagician. You ask why? I point up

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## #2 2009-10-02 11:53:53

Kurtz
Member
Registered: 2007-10-01
Posts: 27

### Re: Grouping

Or does it become

(x - z) (a^4 - b²)  ?

I am a mathemagician. You ask why? I point up

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## #3 2009-10-02 12:20:38

mathsyperson
Moderator
Registered: 2005-06-22
Posts: 4,900

### Re: Grouping

a²x + bx - a²z - bx

a²x - a²z

a²(x-z)

Why did the vector cross the road?
It wanted to be normal.

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## #4 2009-10-02 14:58:59

soroban
Member
Registered: 2007-03-09
Posts: 452

### Re: Grouping

Hello, Kurtz!

Is it possible to solve this problem with the grouping method?

. .

. . . . . . . . . .

. . . . . . . . . .

.

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## #5 2009-10-02 15:37:01

Kurtz
Member
Registered: 2007-10-01
Posts: 27

### Re: Grouping

oops thx that makes a lot more sense because I mess up on writing the problem

it was supposed to be a²x + bx - a²z - bz

thx for overlooking that mistake. and thx so much for helping me.

I am a mathemagician. You ask why? I point up

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## #6 2017-09-06 19:24:57

Monox D. I-Fly
Member
Registered: 2015-12-02
Posts: 857

### Re: Grouping

How did soroban know that the last term was supposed to be -bz?

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## #7 2017-09-06 20:58:01

bob bundy
Registered: 2010-06-20
Posts: 8,137

### Re: Grouping

If you assume that the person setting the question did make a 'do-able' problem then a sign error making it impossible must be a typo.  Over the years I've seen a few.

Bob

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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