Answer:

Step-by-step explanation:
Factor using the perfect square rule.
:)
Answer:
k=4
Step-by-step explanation:
Sure, each of the following lines.
8x-6+3x-1
11x-6-1
and, 11x-7
For any circle with Cartesian equation

,
we have that the centre of the circle is

, and the radius of the circle is

.
So in the case that

,
we essentially have that

.
So the centre of the circle is

, and the radius is

.