Below, I have posted a question and a solution I was provided. The problem is that I don't understand how the part bordered by

**AAA** was arrived at. Specifically

, & why it's simply multiplied against

? After multiplying that expression, I end up with

, & not

. Can anyone help clarify this for me, or is there a better approach?

**Attempt:** Line equation for (2,-2):

From circle equation: centre c = (-1, 2)

Sub c into the line equation:

**AAA**

The distance from the point (-1, 2) to this line is

**AAA** **Ans.** (From text book):

&