Well you can use a positive and a negative number. The number doesn't matter. As long as their is a positive and a negative, multiplying them will always end up with a negative product. Examples are: -3 · 7 = -21. Or 10 · -2 = -20. Hope this helps you :)
Answer:
f(4) = 23
Step-by-step explanation:
Plug x = 4
You determine whether the parabola opens upward, with a positive x^2. It opens downward with a negative x^2.
f(x) is a maximum
g(x) is a minimum