Factorise completely 16y⁴ - 81x⁴
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(16y⁴ - 81x⁴
= ( 4y² )² - (9x²)²
= (4y² +9x²) ( 4y²- 9x²)
= (4y² + 9x²)(2y)² - (3x)²
= ( 4y² +9x²) (2y+3x)(2y-3x)
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