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trying out some of the formatting

testing out some of the formatting...

pre:
is this fixed width?


spoiler:
Why did the chicken cross the road?
Spoiler:
To get to the other side.


tex:


sup:
x2

sub:
an

edit: cool! it worked! :thumb:
by testing
on Mon Dec 08, 2008 8:57 pm
 
Forum: Forum Rules & Guides
Topic: trying out some of the formatting
Replies: 4
Views: 4726

comparing formatting (plz ignore or delete)  TOPIC_SOLVED

comparing formatting for synthetic division of x3 + 4x2 + 5x + 2 by x + 1:

code tags:
Code: Select all
-1 | 1  4  5  2
   |   -1 -3 -2
   ------------
     1  3  2  0

pre tags:
-1 | 1  4  5  2
| -1 -3 -2
------------
1 3 2 0

pre tags easier to read, maybe?
by testing
on Tue Dec 09, 2008 2:50 am
 
Forum: Forum Rules & Guides
Topic: comparing formatting (plz ignore or delete)
Replies: 1
Views: 3893

Cramer's Rule: setting up determinants, which to use  TOPIC_SOLVED

When you're doing Cramer's Rule, like if you have three equations in three unknowns, then you'll have four matrixes that you have to find the determinants of. Is there any easy way to remember how to set those up, and which to use for finding what variable?

Thnx
by testing
on Thu Jan 22, 2009 3:29 pm
 
Forum: Matrix (Linear) Algebra
Topic: Cramer's Rule: setting up determinants, which to use
Replies: 2
Views: 3836

Re: Cramer's Rule: setting up determinants, which to use  TOPIC_SOLVED

That was easier to remember than what they had in the book. Thnx
by testing
on Sat Jan 31, 2009 8:13 pm
 
Forum: Matrix (Linear) Algebra
Topic: Cramer's Rule: setting up determinants, which to use
Replies: 2
Views: 3836

Re: "Topic Solved" button installed

Just used the button. Nice.
by testing
on Sat Jan 31, 2009 8:13 pm
 
Forum: News
Topic: "Topic Solved" button installed
Replies: 5
Views: 8166

solving non-linear system: x - y = 3, x^3 - y^3 = 387  TOPIC_SOLVED

Find all real solutions of the system:

x - y = 3
x^3 - y^3 = 387

Either this is going to be really nasty, or I'm missing some "tricK", I think. Thoughts? Thanks in advance.
by testing
on Fri Feb 06, 2009 3:25 pm
 
Forum: Advanced Algebra ("pre-calculus")
Topic: solving non-linear system: x - y = 3, x^3 - y^3 = 387
Replies: 2
Views: 3203

Find two 2-by-2 invertible matrices with sum not invertible  TOPIC_SOLVED

Find two 2-by-2 invertible matrices whose sum is not invertible.

Do I just start making up matrices, until I find something that works?
by testing
on Mon Feb 09, 2009 12:57 am
 
Forum: Matrix (Linear) Algebra
Topic: Find two 2-by-2 invertible matrices with sum not invertible
Replies: 3
Views: 4148

Re: Find two 2-by-2 invertible matrices with sum not invertible  TOPIC_SOLVED

The determinant for a non-invertible matrix is zero, so these should work: \left[\begin{array}{rr}1&0\\0&1\end{array}\right] \left[\begin{array}{rr}-1&0\\0&-1\end{array}\right] If you add them, you get: \left[\begin{array}{rr}0&0\\0&0\end{array}\right] And any two matrices li...
by testing
on Mon Feb 09, 2009 9:19 pm
 
Forum: Matrix (Linear) Algebra
Topic: Find two 2-by-2 invertible matrices with sum not invertible
Replies: 3
Views: 4148

find equation for line passing through pts of intersection  TOPIC_SOLVED

I have to find an equation for the line that passes through the points of intersection of the circles and . Can I just subtract and get ?
by testing
on Sun Feb 22, 2009 12:37 am
 
Forum: Advanced Algebra ("pre-calculus")
Topic: find equation for line passing through pts of intersection
Replies: 1
Views: 1959
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