solve for m. <--- sign error
I'm always stuck with an wrong answer.
The graph of the function is a parabola opening downward. Choose c such that the vertex lies below the x-axis. <- i understand the part where you factorize the minus sign out. but how did you manage to add this in? <-- actually I added zero, so no damage has been done
[COLOR="red"] The whole procedure is called "Completing the square". Google for it
That means the vertex is at V(1, 1+c)
According to the question the y-coordinate of the vertex must be smaller than zero:
solve for c.
Calculate the coordinates of the point of intersection between the straight line and the curve:
Solve for x. <--- That means apply the quadratic formula and go back to the first question. It's just the same procedure.
You only get one single point of intersection (that's the tangent point!) if the discriminant equals zero. Solve for c. okay i'm totally lost on this question. i think i'll need to wait for my tutorial class for an detailed explanation.