Question

write in vertex form y=x^2-8x+16-16

Answer 1

y=a(x-h)^2+k

h=-b/2a = 8/2 =4

y=(x-4)^2+k

you find k now

Answer 2

vertex form is
y = a(x-h)^2 + k

so, you must modify the expression on the right side

hint: (a-b)^2 = a^2 - 2ab + b^2

Answer 3

would it be 16