Answer:
4x² + 19x - 5 ≤ 0
4x²+20x-x-5≤ 0
per factorization :
4x(x+5)-1(x+5)≤0
(x+5)(4x-1)≤0
x+5≤0
x≤-5
x-4≤0
x≤4
x[-5, 1/4]
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