√(2 + x) - √(2 - x) = 2·√(x - 1)
(√(2 + x) - √(2 - x))^2 = (2·√(x - 1))^2
(2 + x) - 2√(2 + x)√(2 - x) + (2 - x) = 4·(x - 1)
(2 + x) + (2 - x) - 4·(x - 1) = 2√(2 + x)√(2 - x)
8 - 4·x = 2√(2 + x)√(2 - x)
(8 - 4·x)^2 = 4(2 + x)(2 - x)
16·x^2 - 64·x + 64 = 16 - 4·x^2
20·x^2 - 64·x + 48 = 0
x = 1.2 ∨ x = 2
Probe selber machen.