Question

Let f(x) = x to the second power − 8x + 5. Find f(−1).

Answer 1

Hello!

To find the value of f(-1), you need to substitute -1 into each x variable and solve. Remember to use PEMDAS when simplifying.

f(x) = x² - 8x + 5 (substitute -1 for x)

f(-1) = (-1)² - 8(-1) + 5 (simplify the exponent)

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

f(-1) = 1 + 8 + 5 (add alike terms)

f(-1) = 14

Therefore, the value of f(-1) is 14.