Question

Let f(x) = x2 - 8x 5. Find f(-1).

Answer 1

in the equation you have to replace all x's with -1

f (-1) = (-1)^2 - 8(-1) +5
f (-1) = 1 + 8 + 5
f (-1) = 14

the f(-1) stand for the function of -1. it is also equivalent to y

Answer 2

f(-1)=14

Explanation:

Given : Function -
`f(x)=x^2-8x+5`

To find : The value of f(-1)

Solution : Follow the steps :

Step 1- Write the function

`f(x)=x^2-8x+5`

Step 2- Put x=-1 to find the value of f(-1)

`f(-1)=(-1)^2-8(-1)+5`

Step 3- Solve the above equation

`f(-1)=1+8+5`

`f(-1)=14`

Therefore, f(-1)=14