X 2 9x 81 4 July 8, 2019 16 32 64 128 X 2 9x 81 4 factored X 2 9x 81 4 1 4 X 4 9x 2 81 factorise 9 x 8 = (x ^ 2 - 81)/(x - 9) = 0 2^x + 8^x = 130
