Love and code

Dom and Brain are best of friends. Brain loves Dom's sister Mia. Brain tells Dom about his relationship with Mia. Dom said to Brain that if you solve this easy question then I'll allow you both to marry. The question is simple. You are given a 3x3 matrix 'A'. Your task is to calculate the following sum: Sum_Matrix = A + A^2 + A^3 + A^4 + ...... + A^k(where, '^' operator denotes power not XOR) w