### 1 Answer

Relevance

- hayharbrLv 71 month ago
To be less than zero, either the top is negative while the bottom is positive, or vice versa.

Case 1:

top positive when x > 3

bottom negative when -5 < x < 7 so those together give 3 < x < 7

case 2:

top negative when x < 3

bottom positive when x > 7 or x < -5 so those together give x < -5

Answer: x < -5 or 3 < x < 7

Interval notation: (-∞, -5) U (3,7)

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