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Question

Factorise:
x2+1x2-3

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Solution

x2+1x2-3=x2+1x2-2-1=x2+1x2-2×x×1x-1=x-1x2-12 a2-2ab+b2=a-b2=x-1x+1x-1x-1 a2-b2=a-ba+b

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