Question

find vertex: f(x)=(x-4)^+8

Answer 1

do you mean \[(x-4)^2+8\]??

Answer 2

yes ! thanks for correcting me ! sorry

Answer 3

the vertex is (h,k)
the formula is \[y=a(x-h)^2+k\] look familiar?

Answer 4

the vertex is \[(h,k) = (4,8)\]