Решите неравенство: x²-2x-8≥0. Created by m5ovi. algebra-ru

Решите неравенство: x²-2x-8≥0...

March 2022 2 45 Report

Решите неравенство:
x²-2x-8≥0

Verified answer

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; + ∞)

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