The first step to solve this expression is to factor out 4 from the expression 4( - 16) Using the equation a² - b² = (a - b)(a + b), factor the expression in the parenthesis. 4(y² - 4) × (y² + 4) Using the equation a² - b² = (a - b)(a + b), factor the expression in the first parenthesis to find your answer. 4(y - 2) × (y + 2) × (y² + 4) This means that the correct answer to your question is 4(y - 2) × (y + 2) × (y² + 4). Let me know if you have any further questions :)