Question

Solve: 9x^2-49=0
A. -9/49, 9/49
B. -49/9, 49/9
C. -3/7, 3/7
D. -7/3, 7/3​

Answer 1

D. -7/3, 7/3

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

Equality Properties

• Multiplication Property of Equality
• Division Property of Equality
• Addition Property of Equality
• Subtraction Property of Equality

Algebra I

• Multiple Roots

Explanation:

Step 1: Define

9x² - 49 = 0

Step 2: Solve for x

1. [Addition Property of Equality] Isolate x term: 9x² = 49
2. [Division Property of Equality] Isolate x term: x² = 49/9
3. [Equality Property] Isolate x: x = ±7/3