Factorise 1) a⁴+4b⁴ 2) x⁴-7x²y²+9y⁴ 3) (a+b)⁴ - (a+b)² – InterviewSolution

1.	Factorise 1) a⁴+4b⁴ 2) x⁴-7x²y²+9y⁴ 3) (a+b)⁴ - (a+b)² 4) 9p² - 4q² + 4qr - r² 5) 16(3x+y)² - 9(x+ 2y)²
Answer» I don't KNOW how to do what can I do I am SORRY I can't ANSWER

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