Question

If x=-3 calculate the value of the following expression 3x³+(3x+4)-2x²

Answer 1

- 104

Step-by-step explanation:

given the expression

3x³ + (3x + 4) - 2x² ← substitute x = - 3

= 3(- 3)³ + (3(- 3) + 4) - 2(- 3)²

= 3(- 27) + (- 9 + 4) - 2(9)

= - 81 + (- 5) - 18

= - 81 - 5 - 18

= - 86 - 18

= - 104

Answer 2

To find the value of the expression 3x³+(3x+4)-2x² for x=-3, you evaluate each term separately and sum them to get -104.

Step-by-step explanation:

The student is asking for the value of the expression 3x³+(3x+4)-2x² when x is equal to -3.

Let's calculate the value step by step:

1. First, calculate the term 3x³: 3(-3)³ = 3(-27) = -81.
2. Next, evaluate (3x + 4): (3(-3) + 4) = (-9 + 4) = -5.
3. Then, compute -2x²: -2(-3)² = -2(9) = -18.
4. Finally, sum all the values: -81 - 5 - 18 = -104.

So, the value of the expression when x = -3 is -104.