Question

If k(x)=x²-4 find k(2x)


1 -4
2-x²
3-2x²-4
4-4x²-4
​

Answer 1

4. 4x² - 4

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

Algebra I

• Function Notation
• Combining Like Terms

Explanation:

Step 1: Define

k(x) = x² - 4

k(2x) is x = 2x

Step 2: Evaluate

1. Substitute in x: k(2x) = (2x)² - 4
2. Exponents: k(2x) = 4x² - 4