Question

7. Evaluate this expression if x=-2* 3x2 - 4x Need help ASAP Please

Answer 1

Answer:

20

Step-by-step explanation:

Evaluate 3 x^2 - 4 x where x = -2:

3 x^2 - 4 x = 3×(-2)^2 - -2×4

Hint: | Evaluate (-2)^2.

(-2)^2 = 4:

3×4 - 4 (-2)

Hint: | Multiply 3 and 4 together.

3×4 = 12:

12 - 4 (-2)

Hint: | Multiply -4 and -2 together.

-4 (-2) = 8:

8 + 12

Hint: | Evaluate 12 + 8 using long addition.

| 1 |  

| 1 | 2

+ | | 8

| 2 | 0:

Answer: 20