I had to miss school today because I was sick and my parents wouldn't let me go... and I'm looking over the homework, and there is this question: (I don't want the answer!!!)
-5x
*
[2x -6y]
[4b -8a]
(it's a 2x2 matrix, in case it's hard to tell the entries apart)
My question is this: Is there any more simplified version of -5x * -6y than -5x*-6y ?
Like for -5x * 2x I'm pretty sure that's -10x, but for all of the other entries the only way that I can think of answering them is with the same question like for the 4b entry, the only way I can think of answering that is -5x*4b ... is that what I'm supposed to put? Or am I doing something totally wrong?
2007-08-31 06:32:18 · 5 answers · asked by ChipChamp 4 in Science & Mathematics ➔ Mathematics
And no, I don't know the values of x a b or y.
2007-08-31 06:33:25 · update #1
Oh! Thanks everyone! Lol, now it makes sense... :)
2007-08-31 06:45:54 · update #2
You are close....
-5x * 2x is actually -10 x^2 (x squared).
For a more simplified version of -5x * -6y, you will be able to multiply the numbers together but nothing more... so you get: 30xy.
Good luck! and get better soon!
2007-08-31 06:37:57 · answer #1 · answered by sharky.mark 4 · 0⤊ 0⤋
There is a more simplified form. Think about this:
-5x really means -5 * x
4b really means 4 * b
So -5x * 4b really means... what?
Which terms can you then combine?
Good luck!
(PS: -5x * 2x is not -10x.)
2007-08-31 13:40:13 · answer #2 · answered by -a 2 · 0⤊ 0⤋
Just to help a bit, -5x*-2x = -10x^2.
2007-08-31 13:44:38 · answer #3 · answered by jENNIFER z 1 · 0⤊ 0⤋
Same as any algebra expression. -5x*-6y = 30xy
2007-08-31 13:38:09 · answer #4 · answered by chasrmck 6 · 0⤊ 0⤋
30xy is about as simple as it gets.
2007-08-31 13:39:49 · answer #5 · answered by El Jefe 7 · 0⤊ 0⤋