[" Math Test "],[1+4=5],[2+5=12],[3+6=21],[8+11=?],[" Please Answer."]

1+4=5 2 +5=12 5+6=21 8+11=?

Without expanding prove that: |[12, 2, 4, -5, 1],[-8, 1, -5, 2, -1],[6, 4, a ,-3, 2],[-10, 2, 1 ,3 ,4],[-2, 4, 6 ,8, -5]|=|[12, -4, -8, 10, -2],[4, 1, -5, 2, -1],[-3, 4, a, -3, 2],[5, 2, 1, 3, 4],[1, 4, 6, 8, -5]| .

Show that [[5,-1],[6,7]] [[2,1],[3,4]] ne [[2,1],[3,4]] [[5,-1],[6,7]]

Let A=[[1,2,-3],[2,1,-1]] B=[[2,3],[5,4],[1,6]] Find AB .

If A=[[1,2,5],[3,4,6]] and B=[[4,0],[2,1],[1,1]] then find AB

If A = [[1,1,-2],[2,1,-3],[5,4,-9]] , find |A|

Show that: [[5,-1],[6,7]][[2,1],[3,4]] ne [[2,1],[3,4]][[5,-1],[6,7]]

Let A=[[3,6,5],[6,7,8]] and C=[[1,2,-3],[4,5,6]] Find 2A

Compute the following: [[-1,4,-6],[8,5,16],[2,8,5]]+[[12,7,6],[8,0,5],[3,2,4]]

Compute the following: [[-1,4,-6],[8,5,16],[2,8,5]]+[[12,7,6],[8,0,5],[3,2,4]]