Answer: The required value of f(-3) is 11.
Step-by-step explanation: We are given a function f(x) as follows :
[tex]f(x)=x^2-3x-7~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)[/tex]
We are to find the value of f(-3).
To find f(-3), we must substitute x = -3 in equation (i).
From equation (i), we get
[tex]f(-3)\\\\=(-3)^2-3\times(-3)-7\\\\=9+9-7\\\\=18-7\\\\=11.[/tex]
Thus, the required value of f(-3) is 11.