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

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

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b