Question

can anyone that is good with matrices help me out because i really need help on this question i am so confused

Answer 1

sorry i am just in class 10

Answer 2

its ok

Answer 3

Is this the sort of thing u want?

http://www.wolframalpha.com/input/?i= {{0%2C-1}%2C{1%2C0}}+multiply{{3%2C6%2C4}%2C{1%2C2%2C5}}+

Answer 4

no estudier i am still confused

Answer 5

That I gave u is a 90 degree rotation of the triangle (plot it and see).

If that is not it, then I don't really understand what rotation it is that you want.

Answer 6

when it came up it came up at the home screen it did not show anything about the problem

Answer 7

Go to http://www.wolframalpha.com/ and paste

{{0,-1},{1,0}} multiply{{3,6,4},{1,2,5}}

in the box and press return

Answer 8

ok

Answer 9

So, is that what u want?

Answer 10

If it is..

To rotate, use a rotation matrix and premultiply.

Rotation matrix is [cos -sin, sin cos] eg for rotation of 90 degrees = pi/2 then

cos pi/2 = 0 and sin pi/2 is 1.

Answer 11

yes but how would i type the other 2 in there?

Answer 12

First u have to figure out the required rotation matriix according to the post I just made above.

When u have done that, just change the relevant numbers and recalculate.

Answer 13

ok thnk you

Answer 14

To help u on your way with the second one, it wants 180 degrees = pi.

[cos -sin, sin cos] for pi, sin pi is 0 and cos pi is 1.....

Answer 15

Plot them afterwards to make sure u did them right.

Answer 16

ok thnk you so much i was having so much trouble

Answer 17

ur welcome.

Answer 18

what did answer did you get

Answer 19

The first one is answered in the thread I gave u link and the second one is started, just follow the same method...