6) (2a 3b) ^ 2 - 4a(a - 6b) July 8, 2019 16 32 64 128 6) (2a + 3b) ^ 2 - 4a(a - 6b) (3a ^ 2 - 6ab + 3b ^ 2)/(6a ^ 2 - 6b ^ 2)
