Because it is vertical, k 1*k2=- 1, so the slope of the linear L equation is 2.
When P is brought in, the solvable equation L is: y=2x-5, and the maximum distance that can be solved by using the distance from a point to a straight line is: root number 5.
2. After simplification, we get (x- 1) square +y square = 1, so the circle takes (1, 0) as the dot and 1 as the radius.
The straight line L intersects with the point (0, 1), because L is a vertical equation, so according to the vertical diameter theorem, the straight line L must intersect with the point (1, 0), so according to the points (0, 1) and (1, 0), the value of A is-.
If you still don't understand, you can ask me