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1)25^2-81Y^2
2)0.09-0.16C^2
3)9a^4-49b^6
4)(8+6x)^2-1
1)25^2-81Y^2
2)0.09-0.16C^2
3)9a^4-49b^6
4)(8+6x)^2-1
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Answers & Comments
2)(0.3-0.4c)(0.3+0.4c)
3)(3a^2-7b^3)(3a^2+7b^3)
4)(8+6x-1)(8+6x+1)=(7+6x)(9+6x)
2).0,09-0,16c^2=(0,3-0,4c)(0,3+0,4c)
3).9a^4-49b^6=(3a^2-7b^3)(3a^2+7b^3)
4).(8+6x)^2-1=(8+6x-1)(8+6x+1)=(6x+7)(6x+9)