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
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I don't know how to do what can I do I am sorry I can't answer
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