This question is given 2 marks, which means that you do not need to do much to complete this, and anything more than a few lines and 2 minutes spent means that you are wasting your time.
You effectively have to show that you have selected the right approach and that you have produce the right answer. However, just writing the answer alone will not give you the 2 marks you need.
Divide this problem up into two parts being the and
For the expression to be greater than zero, then both of these parts must be positive or both must be negative (since multiplying two negatives will create a positive – you knew that, didn’t you!).
For both of these parts to be positive, then must be greater than 4 (NOTE: not greater than or equal to – it must be GREATER than only otherwise it will become zero).
For both to be negative, then must be less than zero.
So the answer will be that is either greater than 4 or less than 0 and this can be expressed in the following conditions