a) Let A and B be two 2 x 2 matrices, each of which commutes (multiplicatively) with C =

[ 0 1]. show that AB = BA

[ -1 0]

b) use mathematical induction to show that for all positive integers n,

[1 x y]^n

[0 1 x]

[0 0 1]

=

[1 nx ny+(n(n-1)/2)x²]

[0 1 nx]

[0 0 1]

i just started taking this class i have no idea where to start =(