4x(x-2) + 11x > (2x+4)²/ 10
4x² - 8x + 11x > (4x² + 16x + 16)/10
4x² + 3x > (4x² + 16x + 16)/10
40x² + 30x > 4x² + 16x + 16
36x² + 14x - 16 > 0
18x² + 7 - 8 > 0
Δ = 49 + 576 = 625
√Δ = 25
x₁ = (-7-25)/36 = -32/36 = -8/9
x₂ = (-7+25)/36 = 18/36 = 1/2
a > 0
x ∈ (-∞,-8/9) u (1/2,+∞)