MatrixPower
MatrixPower[m, n] gives the nth matrix power of the matrix m.
Examples
Square a matrix:
MatrixPower[{{1, 1}, {1, 0}}, 2]
(* {{2, 1}, {1, 1}} *)Fibonacci via matrix power:
MatrixPower[{{1, 1}, {1, 0}}, 10]
(* {{89, 55}, {55, 34}} *)Please visit the official Wolfram Language Reference for more details.