X 2 4x 2 8 x 2 4x ) 15 0 July 8, 2019 16 32 64 128 X 2 4x 2 8 x 2 4x )+ 15 0 (x ^ 2 - 4x) ^ 2 - 2(x ^ 2 - 4x) - 15 = 0 ((8x)/(4 - x ^ 2) + (2 - x)/(2 + x)) / ((2 + x)/x)