Question

Решите уравнение:
2-x=√x+10

Answer 1

x ≤  2

(2 - x)² = (√x + 10)²

4 - 4x + x² = x + 10

x² - 5x - 6 = 0

Δ = 25 + 24 = 49

x1 = (5 + 7)/2 = 12/2 = 6

x2 = (5 - 7)/2 = - 2/2 = -1

x = { - 1 }