Let f(x) = x² − 8x + 5. Find f(−1).

We have the function f(x) = x² − 8x + 5

Answer: For f(x) = x² − 8x + 5, f(-1) = 14

We will substitute -1 for x in the function f(x) = x² − 8x + 5

Explanation:

f(x) = x² − 8x + 5

Substitute -1 for x in the function f(x) = x2 − 8x + 5

f(-1) = (-1)² − 8 (-1) + 5

= 1 + 8 + 5

= 14

Thus, the value of f(-1) is 14