(vii) (a + b)³-16(a + b) (viii) a² + 2a-b² +1 (ix) 4x² - y²-4y-4 (x) x²-3x²y² + y²4. Factorise the following
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(a+b)² a² + b ² +2ab(a+b)² a² + b ² +2ab(a+b)² a² + b ² +2ab(a+b)² a² + b ² +2ab(a+b)² a² + b ² +2ab
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(a+b)² a² + b ² +2ab
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