Factorise a^4+9b^4+2a^2b^2
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Step-by-step explanation:
(a ^2 +b ^2 ) ^2
a ^4 +2a ^2 b ^2+b ^4
=(a^ 2)^2 +2a^2b ^2 +(b ^2) ^2
=(a^2+b^ 2 ) ^2
it cannot factories
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