(11x - 4)/5 ≥ x²/2
2(11x - 4) ≥ 5x²
5x² - 22x + 8 ≤ 0
D = 22² - 4*5*8 = 324 = 18^2
x12=(22 +- 18)/10 = 4 2/5
++++++[2/5] ------------ [4] ++++++++
x∈ [2/5, 4]
длина 4 - 2/5 = 3 3/5 = 3.6
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Verified answer
(11x - 4)/5 ≥ x²/2
2(11x - 4) ≥ 5x²
5x² - 22x + 8 ≤ 0
D = 22² - 4*5*8 = 324 = 18^2
x12=(22 +- 18)/10 = 4 2/5
++++++[2/5] ------------ [4] ++++++++
x∈ [2/5, 4]
длина 4 - 2/5 = 3 3/5 = 3.6