x ⊂ (-∞; -1] ∪ [0.4; +∞)
Объяснение:
g(f(x)) = (5x-1)² +
25x - 5 - 6 = 25x² - 10x+1 + 25x -11 = 25x² + 15x - 10
25x² + 15x - 10 ≥0
25x² + 15x - 10 = 0
D = 225 + 1000 = 1225 = 35²
x₁₋₂ = ( -15 ±35)/50
x₁ = -1
x₂ = 2/5 = 0.4
