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-x² - 2x + 15 ≤ 0
Δ = 4 + 60 = 64, √Δ = 8, x1 = 2 - 8 / -2 = 3, x2 = 2 + 8 / -2 = -5
rysujesz małą parabolkę ramionkami do dołu (bo a < 0) z pierwiastkami -5 i 3 i dostajesz:
x∈(-∞, -5> U <3, +∞) i GOTOWE!!!