Given the function f (x) = 5x2 - 9x + 18, find f (3).

A) f (3) = 31

B) f (3) = 36

B) f (3) = 49

D) f (3) = 85

f (3) = 36

Step-by-step explanation:

To evaluate f (3) substitute x = 3 into f (x), that is

f (3) = 5 (3) ² - 9 (3) + 18 = 5 (9) - 27 + 18 = 45 - 27 + 18 = 36

Answer: f (3) = 36

Step-by-step explanation:

F (x) = 5x2-9x+18

Looking at this equation;

F (x) = f (3)

I. e substitute

X=3

Substitute for x=3 in f (x)

F (3) = 5 (3) 2-9 (3) + 18

F (3) = 5 (9) - 27+18

F (3) = 45-27+18

F (3) = 36

So final answer is

F (3) = 36