x = 4
√x-3 + √x+5 = 4
(√x-3)² = (4-√x+5)²
x-3 = 16 - 8√x+5 + x+5 | -x
- 3 = 21 - 8√x+5
- 24 = - 8√x+5 | ×(-1)
24 = 8√x+5 | : 8
3 = √x+5
3² = (√x+5)²
9 = x + 5
