Answer:
-5/6 < x < 0
Explanation:
x(6x+5)
these are the factors of a quadratic that opens up. The value will be less than zero between the roots.
the roots are:
x = 0
6x + 5 = 0
6x = -5
x = -5/6
x = {-5/6, 0}
Therefor
x(6x + 5) < 0
-5/6 < x < 0
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To see this visually look at the graph
See where the parabola is below the x-axis