(7x-9)(7x+9)
64-x²
3m² -6mn +4m -8n
(3x+1)(9 x^2-3x+1)
(m-2n)(3m+4)
27x^3+1
125m^3+64
49x² -81
15x^3+x^2-12x^4
(8-x)(8+x)
x^2 (15x+1-12 x^2)
(5m+4)(25 m²-20m+16)
