By expressing $$\(-2 x^{2}+8 x+11\)$$ in the form $$\(-a(x-b)^{2}+c\)$$, where $$\(a, b\)$$ and $$\(c\)$$ are positive integers, find the coordinates of the vertex of the graph with equation $$\(y=-2 x^{2}+8 x+11\)$$. ........................................................................................................................................................ . ........................................................................................................................................................ . ........................................................................................................................................................ . ........................................................................................................................................................ . ........................................................................................................................................................ . ........................................................................................................................................................ . ........................................................................................................................................................ . ........................................................................................................................................................ .

Answer:

Knowledge points:

Solution: