Question

The following is the graph of f(x) = -x^2 + 10x - 21. true or false

Answer 1

I don't see a question.

Answer 2

Oh wait.

Answer 3

Sorry.

Answer 4

f(x) = -x^2 + 10x - 21
f(x) = -(x^2 - 10x + 21)
f(x) = -(x^2 - 10x + 25) + 4
f(x) = -(x-5)^2 + 4

so true because the form is:
f(x) = a(x-h) + k

Answer 5

Wait, I may have made a mistake.

Answer 6

Never mind, it's fine.

Answer 7

thanks! :)

Answer 8

No problem :)