[tex]1) (b-5a)(b^{2} +5ab+25a^{2} )[/tex][tex]2) (c - d - a)(c + d + a)[/tex][tex]3) 7(a-2c)(a+2c)[/tex]
[tex]4) 2(10n-1)^{2}[/tex]
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[tex]1) (b-5a)(b^{2} +5ab+25a^{2} )[/tex]
[tex]2) (c - d - a)(c + d + a)[/tex]
[tex]3) 7(a-2c)(a+2c)[/tex]
[tex]4) 2(10n-1)^{2}[/tex]