Factorisation of y⁴ - 81x⁴ is
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Answer:
- (y-3x) (y+3x) (y²+9x²)
Step-by-step explanation:
y⁴- 81x⁴= (y²)² - (9x²)²
= ( y² - 9x²) ( y²+9x²)
[a²-b²=(a-b)(a+b) ]
= ( y² - (3x)²) ( y²+ 9x²)
= (y-3x) ( y+ 3x) ( y² + 9x²)
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