1.4а^2+9а-9
2.15b^2-22b+8
3.(a+4)(a-1)(3a-2)
4.n^2+3mn-4m^2
5. 2a^2-13ab+6b^2
6.12c^2-5cd-3d^2
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Answers & Comments
1.4а^2+9а-9
2.15b^2-22b+8
3.(a+4)(a-1)(3a-2)
4.n^2+3mn-4m^2
5. 2a^2-13ab+6b^2
6.12c^2-5cd-3d^2