Answer:
6
Explanation:
Evaluate 4 z^2 - 3 z - 4 where z = 2:
4 z^2 - 3 z - 4 = 4×2^2 - 3×2 - 4
Hint: | Evaluate 2^2.
2^2 = 4:
4×4 - 3×2 - 4
Hint: | Multiply 4 and 4 together.
4×4 = 16:
16 - 3×2 - 4
Hint: | Multiply -3 and 2 together.
-3×2 = -6:
16 + -6 - 4
Hint: | Group the negative terms in 16 - 6 - 4 together and factor out the minus sign.
16 - 6 - 4 = 16 - (6 + 4):
16 - (6 + 4)
Hint: | Evaluate 6 + 4.
6 + 4 = 10:
16 - 10
Hint: | Subtract 10 from 16.
| 1 | 6
- | 1 | 0
| 0 | 6:
Answer: 6