Question

Find f(−1) given that f(x)=x3+2x2+3x+4.
A. 10
B. -2
C. 2
D. -10

Answer 1

The answer is option C

Explanation:

f(x) = x³ + 2x² + 3x + 4

To find f(-1) substitute the value of x that's

- 1 into f(x)

That's

`f( - 1) = ({ - 1})^(3) + 2 ({ - 1})^(2) + 3( - 1) + 4 \\ = - 1 + 2(1) - 3 + 4 \\ = - 1 + 2 - 3 + 4 \\ = 1 - 3 + 4`

We have the final answer as

`f( - 1) = 2`

Hope this helps you