Question

Evaluate the function below for X=3:

2x^3 - x^2 - 4x + 9
A. 9
B. 42
C. 60
D. 204

Answer 1

The answer is:

B. 42.

Answer 2

42

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

1. Brackets
2. Parenthesis
3. Exponents
4. Multiplication
5. Division
6. Addition
7. Subtraction

• Left to Right

Explanation:

Step 1: Define

2x³ - x² - 4x + 9

x = 3

Step 2: Evaluate

1. Substitute in x: 2(3)³ - 3² - 4(3) + 9
2. Exponents: 2(27) - 9 - 12 + 9
3. Multiply: 54 - 9 - 12 + 9
4. Subtract: 45 - 12 + 9
5. Subtract: 33 + 9
6. Add: 42