Answer :

[tex]y^4-36=(y^2)^2-6^2=(y^2-6)(y^2+6)=[y^2-(\sqrt6)^2](y^2+6)\\\\=(y-\sqrt6)(y+\sqrt6)(y^2+6)\\\\\\\\\\a^2-b^2=(a-b)(a+b)[/tex]

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