Answers for wk 6:
1) ![x\in(-\infty,0)](http://latex.codecogs.com/gif.latex?x\in(-\infty,0))
2)![\sqrt{x}](http://latex.codecogs.com/gif.latex?\sqrt{x})
2)
Solution (1):
Since the numerator of the fraction is always positive or 0, thus the expression on the LHS is only less than or equal to 0 if and only if the denominator, x, is negative. Hence, the range for x is actually:
Solution (2):