已知过点A(-1,-1)的直线L与圆x2+y2-2x+6y+6=0相交,求直线L斜率的取值范围.
问题描述:
已知过点A(-1,-1)的直线L与圆x2+y2-2x+6y+6=0相交,求直线L斜率的取值范围.
答
x2+y2-2x+6y+6=0.(x-1)^2 + (y+3)^2 = 4,圆心(1,-3),半径=2因为“已知过点A(-1,-1)的直线L与圆x2+y2-2x+6y+6=0相交”,故圆心到该直线的距离