Answer:
[tex]\huge\boxed{\sf 81x^4 - 16y^4}[/tex]
Step-by-step explanation:
Given expression:
= (3x - 2y)(3x + 2y)(9x² + 4y²)
Using formula:
- [tex](a+b)(a-b)=a^2-b^2[/tex]
= [(3x)² - (2y)²] (9x² + 4y²)
= (9x² - 4y²)(9x² + 4y²)
Using the above formula again
= (9x²)² - (4y²)²
= 81x⁴ - 16y⁴
[tex]\rule[225]{225}{2}[/tex]
