Hi Solveit,
y=-x^2+k^2
Vertex is (0,k^2)
Find roots of the parabola y=0
0=-x^2+k^2
x= +/- k
Area = 1/2 * 2k * k^2 = 64
k^3=64
k=4
This is not a complete answer - it is just a good outline.
Let me know if you need more.
You should check it anyway :)
Thank you Melody !
I alredy cheked it and it is complete answer :P
