More questions before the 3rd

[Salvadoramerican]

[unparseable or potentially dangerous latex formula] and [unparseable or potentially dangerous latex formula] then [unparseable or potentially dangerous latex formula] then w+x+y+z=?

Let a abd b be non zero real numbers such that 9a^2-2ab+4b^2=0. Find ratio a to b

Nsguy explain this already but some refresher wouldn't hurt, just to be safe
Saturday, Dec 25, 2004 was Christmas. What day of the week will Christmas fall in 2011.

[BlasianAsian]

Ok. Do you know how to multiply matrices? 'Cause I really don't want to explain, and it can get complicated. Erg.

Check # or in the textbook.

[FabensMath]

What do you mean "before the third"?

[nsguy1350]

Ok, notice that [(1,0)(0,1)] is an identity matrix. I think that you can just find the inverse of the first matrix (A) to find out.
If you have a TI-89, enter: [-1,-2;3,4]^(-1) to find the inverse.
If you have an 83/84, I think you enter the matrix in the matrix menu, then either use the inverse function if there is one, or put it to the -1.

Did you mean 12ab in the second one? Then, you could factor that into [unparseable or potentially dangerous latex formula]. Square rooting both sides gives [unparseable or potentially dangerous latex formula], so [unparseable or potentially dangerous latex formula],
so [unparseable or potentially dangerous latex formula].

Ok, well, you go through 7 years from 2004 to 2011. The only leap day between Christmas 2004 and 2011 occurs in 2008 (The leap year had already passed in 2004).
This means you go through 7x365 + 1 days. Modding 7x365 + 1 by 7 is easy, since the 7x365 will give 0, and the 1 is just 1. You advance one day from Saturday to Sunday, so your final answer is Sunday.

By the "3rd" I believe he is referring to March 3, a Saturday where we are having our next competition.

[Salvadoramerican]

thanks nsguy, and yeah i forgot the 1. I edited does it look a lot better

[nsguy1350]

No problem, I put matrices on here before, with a quick search on matrix notation in LaTeX.