# Math Help - help, 2 problems

1. ## help, 2 problems

I didn't know how to write these two problems without the proper symbols so I scanned them.
TIA

2. Originally Posted by mantis
I didn't know how to write these two problems without the proper symbols so I scanned them.
TIA
For the first problem, compute a few powers of B by hand and look for a pattern. You won't find a single closed formula, but a repeating pattern that should become apparent once n = 7 or so.

For the second problem, find a fourth vector such that the new vector together with the three given here forms a triangular matrix. Think about why that is sufficient. You may have to rearrange the order of the three vectors given here just a little.