Question

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

Answer 1

replce -1 with x and solve the equation

Answer 2

replace

Answer 3

(-1)^2 - 8(-1) + 5.

Answer 4

Like Zale is saying: replace every copy of 'x' with -1 and then follow PEMDAS to evaluate and simplify.


\[\large f(x) = x^2 - 8x + 5\]


\[\large f(-1) = (-1)^2 - 8(-1) + 5\]


\[\large f(-1) = 1 - 8(-1) + 5\]


\[\large f(-1) = 1 + 8 + 5\]


\[\large f(-1) = 9 + 5\]


\[\large f(-1) = 14\]

Answer 5

@jim_thompson5910 thankyou !

Answer 6

you're welcome