(2x - 7)² ≥ (6x + 1)²
(2x - 7)² - (6x + 1)² ≥ 0
(2x - 7 + 6x + 1)(2x - 7 - 6x - 1) ≥ 0
(8x - 6)(- 4x - 8) ≥ 0
8 * ( - 4) *(x - 0,75)(x + 2) ≥ 0 |: (- 32)
(x - 0,75)(x + 2) ≤ 0
+ - +
___________[-2]__________[0,75]___________
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x ∈ [- 2 ; 0,75]