Question 461906
If y = 2x + 3, then solve the inequality x(2x + 3) <0.

The critical numbers are 0, -1.5.
For x < -1.5, x(2x + 3) > 0.
For -1.5 < x < 0, x(2x + 3) < 0.
For x > 0, x(2x + 3) > 0.
Therefore the range of x is the interval(-1.5, 0).