Question

Between which two ordered pairs does the graph of f(x) = x2 + x – 9 cross the negative x-axis?

Quadratic formula: x =

(–6, 0) and (–5, 0)
(–4, 0) and (–3, 0)
(–3, 0) and (–2, 0)
(–2, 0) and (–1, 0)

Answer 1

You stay right her and i want you to replace all the letters with the numbers so a =1/2 b=1 c=-9 and simplify it down a little bit.

Answer 2

okay

Answer 3

okay did you substitute them?

Answer 4

yeah

Answer 5

type out what you got