1) 9x^2-4 = (3x+2)(3x-2)
2)4a^2-20ab+25b^2 = (2a-5b)²
3) 49-25n^2 = (7+5n)(7-5n)
4) 9z^4 y^4-16x^2 = (3z²y² + 4x)(3z²y²- 4x)
5) 25a^6-100 = (5a³+10)(5a³-10)
1) 9x^2-4 = (3x+2)(3x-2)
2)4a^2-20ab+25b^2 = (2a-5b)²
3) 49-25n^2 = (7+5n)(7-5n)
4) 9z^4 y^4-16x^2 = (3z²y² + 4x)(3z²y²- 4x)
5) 25a^6-100 = (5a³+10)(5a³-10)