8. 2sqrt(1 - x ^ 2) - 3(sqrt(1 - x) + sqrt(1 + x)) = x ^ 2 + 7x + 8 (x - 3)/(x - 1) * sqrt((1 + x)/(1 - x)) = (2x + 3) * sqrt(2x + 1) 10 x + 5sqrt(1 - sqrt(1 - x)) = 6sqrt(1 - x) 11. (x + 5) * sqrt(x + 1) + 1 = root(3x + 4, 8)