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1. 49x² -81
2. 64-x²
3. 27x^3+1
4. 3m² -6mn +4m -8n
5. 125m^3+64
6. 15x^3+x^2-12x^4

15x^3+x^2-12x^4

27x^3+1

64-x²

125m^3+64

(7x-9)(7x+9)

(5m+4)(25 m²-20m+16)

(m-2n)(3m+4)

3m² -6mn +4m -8n

(3x+1)(9 x^2-3x+1)

49x² -81

x^2 (15x+1-12 x^2)

(8-x)(8+x)