Respuesta :

Space

Answer:

4x² - 9y²

General Formulas and Concepts:

Pre-Algebra

  • Distributive Property

Algebra I

  • Terms/Coefficients/Degrees

Step-by-step explanation:

Step 1: Define

Set up expression

12x² + 3xy - 5y² - (8x² + 3xy + 4y²)

Step 2: Simplify

  1. Distributive negative:                      12x² + 3xy - 5y² - 8x² - 3xy - 4y²
  2. Combine like terms (x²):                  4x² + 3xy - 5y² - 3xy - 4y²
  3. Combine like terms (xy):                  4x² - 5y² - 4y²
  4. Combine like terms (y²):                  4x² - 9y²

Otras preguntas