Question

f(x) = x2 – 4x – 21.

Answer 1

What is the question being asked?

Answer 2

@emolyrics2 - you can just put the question here so someone can help :)

Answer 3

I think its solve for f(x)

Answer 4

f(x) = -2x-21 = 0
f(x) = -2x = 21
f(x) = x = 21/2
f(x) = 0 when x = 10.5

Answer 5

you can switch the value f(x) with 0

so you start with x2 – 4x – 21 = 0
and so on