Решите неравенство: x²-2x-8≥0
Задание решено..............
X^2 - 2x - 8 ≥ 0 x^2 - 2x - 8 = 0 D = 4 + 32 = 36 x1 = (2 + 6)/2 = 8/2 = 4 x2 = (2 - 6)/2 = - 4/2 = - 2 + - + ---------⚫--------------------⚫---------------> x - 2 4 x ∈ ( - ∞; - 2] ∪ [4; + ∞)