Equations with parenthesis?

bobbym · 2011-01-12 07:45:22

Well, they are darn close, usually we follow a convention when writng things. We say -12 xy not -12yx. Start to do things in a more orderly fashion. That will cut down on silly mistakes.

misheeru · 2011-01-12 07:47:41

Ah... okay.

8x² - 2xy - 12xy + 3y²

Is -2xy in need of editing as well?

bobbym · 2011-01-12 07:50:06

Now look at it. Are there terms that are the same that can be combined?

misheeru · 2011-01-12 07:52:22

We will see...

8x² - 2xy - 12xy + 3y²

(-2xy) - (- 12xy)

= 10xy

= We will see...

8x² + 10xy + 3y²

Is that alright?

bobbym · 2011-01-12 07:55:27

8x² - 2xy - 12xy + 3y²
(-2xy) - (- 12xy)

This is why I do not use the foil method. Why people in the past were better at math than today's people.

You are not subtracting a negative , you are subtracting a positve 12xy.

misheeru · 2011-01-12 07:57:58

Oh... okay

so...

8x² - 2xy - 12xy + 3y²

(-2xy) - (12xy)

= - 14xy

= 8x² - 14xy + 3y²

bobbym · 2011-01-12 08:00:32

Correct! I think you need another one.

misheeru · 2011-01-12 08:01:43

Me too...

(give me five to whip up a quick sandwich)

Next... (ab - 9)(ab + 8)?

bobbym · 2011-01-12 08:06:50

Okay, what is the sandwich?

misheeru · 2011-01-12 08:08:49

The ham I spoke of earlier.

bobbym · 2011-01-12 08:09:50

Okay.

misheeru · 2011-01-12 08:10:51

Okay? Are you alright?

bobbym · 2011-01-12 08:12:21

Yes, I am fine. Now what about the solution.

misheeru · 2011-01-12 08:16:09

Are you sure?

(ab - 9)(ab + 8)

*F* (ab)(ab) = a²b²

*O* (ab)(8) = 8ab

*I* (-9)(ab) = -9ab

*L* (-9)(8) = -72

Am I darn close?

bobbym · 2011-01-12 08:17:28

Nope! That is correct. Now for the final touches.

misheeru · 2011-01-12 08:19:54

Wow... I almost fainted just then.

*F* (ab)(ab) = a²b²

*O* (ab)(8) = 8ab

*I* (-9)(ab) = -9ab

*L* (-9)(8) = -72

= a²b² + 8ab - 9ab -72

(8ab) - (9ab) = - 1ab

a²b² - ab -72?

bobbym · 2011-01-12 08:21:51

That is good. You did that right and it actually looks like math.

misheeru · 2011-01-12 08:23:05

I may faint again.

And gee thanks, if the others were not math- then what were they?

bobbym · 2011-01-12 08:30:31

Well actually, they were a bit discombombulated. This one is neat and readable. Did I ever tell you about my favorite math teacher?

misheeru · 2011-01-12 08:36:59

Nope.

bobbym · 2011-01-12 08:41:06

Yes a certain Miss Z_ _ _ _ _. DDG! Said my work was too hard to hard to understand. Ever see "A Beautiful Mind?"

misheeru · 2011-01-12 08:44:08

Yes, but it was a very very long time ago.

My new doctor is DDG, by the way. She is also a hell of a lot smarter then the old one.

bobbym · 2011-01-12 08:46:10

Hope you get good treatment. DDG , I doubt it.

misheeru · 2011-01-12 08:52:51

Me too... she has already stated that she doesn't feel a 17 year old should be taking vicoden on a regular basis like I have been. She has also stated that she wants to get me into see a neurologist.

Well I think so, at the very least she is very hot.

bobbym · 2011-01-12 08:56:06

Yes, but how would you know what is DDG to me?

Math Is Fun Forum

#726 2011-01-12 07:45:22

Re: Equations with parenthesis?

#727 2011-01-12 07:47:41

Re: Equations with parenthesis?

#728 2011-01-12 07:50:06

Re: Equations with parenthesis?

#729 2011-01-12 07:52:22

Re: Equations with parenthesis?

#730 2011-01-12 07:55:27

Re: Equations with parenthesis?

#731 2011-01-12 07:57:58

Re: Equations with parenthesis?

#732 2011-01-12 08:00:32

Re: Equations with parenthesis?

#733 2011-01-12 08:01:43

Re: Equations with parenthesis?

#734 2011-01-12 08:06:50

Re: Equations with parenthesis?

#735 2011-01-12 08:08:49

Re: Equations with parenthesis?

#736 2011-01-12 08:09:50

Re: Equations with parenthesis?

#737 2011-01-12 08:10:51

Re: Equations with parenthesis?

#738 2011-01-12 08:12:21

Re: Equations with parenthesis?

#739 2011-01-12 08:16:09

Re: Equations with parenthesis?

#740 2011-01-12 08:17:28

Re: Equations with parenthesis?

#741 2011-01-12 08:19:54

Re: Equations with parenthesis?

#742 2011-01-12 08:21:51

Re: Equations with parenthesis?

#743 2011-01-12 08:23:05

Re: Equations with parenthesis?

#744 2011-01-12 08:30:31

Re: Equations with parenthesis?

#745 2011-01-12 08:36:59

Re: Equations with parenthesis?

#746 2011-01-12 08:41:06

Re: Equations with parenthesis?

#747 2011-01-12 08:44:08

Re: Equations with parenthesis?

#748 2011-01-12 08:46:10

Re: Equations with parenthesis?

#749 2011-01-12 08:52:51

Re: Equations with parenthesis?

#750 2011-01-12 08:56:06

Re: Equations with parenthesis?

Board footer