4x ^ 2 - 5x - 12 = 8 July 8, 2019 16 32 64 128 4x 2 5x 12 8 4x 2 5x 12 8x 4x 2 5x 12 0 8 4x 2 5x 7 )+( 3x 2 8x 12 8x 2 4x 12 )-( 5x 2 x 3 2^x + 8^x = 130