X 7 x 2 2 2 5 9x 4 July 8, 2019 16 32 64 128 (x - 7) ^ 2 = (9 - x) ^ 2 2 ⋅ ( 7 + 9 x ) = − 6 x + 2 9 * (x + 5) ^ 2 - (x - 7) ^ 2
