A^2 - (a-2)^2 = 16A^2 - (a^2 - 4a + 4) = 16A^2 - a^2 + 4a - 4 = 16A^2 - a^2 + 4a - 20 = 0
(y+4)^4 - (y+8)(y-8) = 96(y+4)^4 - (y^2 - 64) = 96(y+4)^4 - y^2 + 64 = 96(y+4)^4 - y^2 - 32 = 0
A^2 - (a-2)^2 = 16
A^2 - (a^2 - 4a + 4) = 16
A^2 - a^2 + 4a - 4 = 16
A^2 - a^2 + 4a - 20 = 0
(y+4)^4 - (y+8)(y-8) = 96
(y+4)^4 - (y^2 - 64) = 96
(y+4)^4 - y^2 + 64 = 96
(y+4)^4 - y^2 - 32 = 0