Question

Evaluate the following expression when x=−2. 3x3−x2+2x+9

Answer 1

-19

Explanation:

To find the value of the expression 3x^3 - x^2 + 2x + 9 when x = -2, we substitute -2 for x in the expression.

First, let's substitute -2 for x in each term of the expression:

3(-2)^3 - (-2)^2 + 2(-2) + 9

Next, let's simplify each term:

3(-8) - 4 + (-4) + 9

Now, calculate each term:

-24 - 4 - 4 + 9

Combine like terms:

-28 + 9 + 9

Simplify further:

-19

Therefore, when x = -2, the value of the expression 3x^3 - x^2 + 2x + 9 is -19.