It is known that the parabola y squared = - x intersects the straight line L: y = K (x + 1) at two points a and B (1) OA vertical ob (2) When the area of the triangle OAB is equal to the root 10, the value of K is obtained

It is known that the parabola y squared = - x intersects the straight line L: y = K (x + 1) at two points a and B (1) OA vertical ob (2) When the area of the triangle OAB is equal to the root 10, the value of K is obtained

Simultaneous equations
Then the condition is found perpendicular to ob through OA
Determine the value by the triangle area equal to the root 10
There should be many examples in the book, but the values have changed