a^4-10a^2+169 factorise
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Step-by-step explanation:
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Answered by
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Step-by-step explanation:
(a^2)^2-2*a^2*13+(13)^2
By (a-b)^2=a^2-2ab+b^2
(a^2-13)^2
(a^2-13)(a^2-13)
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