а) 2ab(9b^2-a^2)=2ab(3b-a)(3b+a)
b) (a^2+3b)(a^2+3b)
3) 2(25-y^4)+y^4-6y^2+9-(4y^2-y^4+4y-y^3-4+y^2)=
50-2y^4+y^4-6y^2+9-4y^2+y^4-4y+y^3+4-y^2=y^3-11y^2-4y+63
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Answers & Comments
а) 2ab(9b^2-a^2)=2ab(3b-a)(3b+a)
b) (a^2+3b)(a^2+3b)
3) 2(25-y^4)+y^4-6y^2+9-(4y^2-y^4+4y-y^3-4+y^2)=
50-2y^4+y^4-6y^2+9-4y^2+y^4-4y+y^3+4-y^2=y^3-11y^2-4y+63