Why won't it give me full marks for this? What have I missed?
The question is from Mathswatch.

me! what did you put for this question?

step-by-step explanation:

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!