Question

Evaluate f(9) given the function f(x)=3x2 – 11x - 21*

Answer 1

123

Explanation:

The given function is :

`f(x)=3x^2 - 11x - 21`

We need to find the value of f(9). It can be done by putting x = 9 in the above function as follows :

`f(9)=3(9)^2 - 11(9) - 21\\\\=243-99-21\\\\=123`

So, the value of f(9) is 123.