Question

What is f(1)

What is f(-1)

Answer 1

f(1) = 1 , f(- 1) = - 3

Explanation:

given

f(x) = - x² + 3x - 1

(e)

to evaluate f(1) , substitute x = 1 into f(x)

f(1) = - 1² + 3(1) - 1

= - 1 + 3 - 1

= 2 - 1

= 1

(f)

to evaluate f(- 1), substitute x = - 1 into f(x)

f(- 1) = - (- 1)³ + 3(- 1) - 1

= - (- 1) - 3 - 1

= 1 - 4

= - 3