X 12 2x 13 July 8, 2019 16 32 64 128 2.5 x 12 2x 13 12 2x 13 x 20 4 12 x 2 2x 13 13 x − 12 )= 2x 1 2 x 13 12 x 12 x 13 2^x + 8^x = 130