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Question

Factorise using identities:
(a2)2+2×a2×4+42

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Solution

(a2)2+2×a2×4+42(Given)=(a2)2+a2×4+a2×4+42=a2(a2+4)+4(a2+4)=(a2+4)(a2+4)=(a2+4)2

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