51.7k views
20 votes
<

When f(x) = 9x² - 5x + 3, evaluate f(-3)
f(− 3) =
Question Help: Video
Add Work
Submit Question
Jump to Answer

User Zakkiyya
by
7.8k points

1 Answer

5 votes

Answer:

Explanation:

Remark

f(x) = 9x^2 - 5x + 3 is given. The notation means that wherever you see and x on the right, you replace it with the x in the brackes on the left. f(3) is a direction, not anything you have to adjust or manipulate.

Solution

f(-3) = 9*(-3^2) - 5*(-3) + 3 (-(3))^2 = -3 * -3 = 9 two minuses make a +

f(-3) = 9*(-3)(-3) + 15 + 3 -3 times an operation of minus equals a +

f(-3) = 9 * 9 + 15 + 3

f(-3) = 81 + 15 + 3

Answer: f(-3) = 99

User Tad Donaghe
by
7.8k points