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Mathematics analytic geometry in senior one.
1, the maximum distance, then the connecting line between the origin O and the point P is perpendicular to the straight line L, and the OP straight line equation can be known as: y=- 1/2x.

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-.

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