taller resuelto de diferencia de cuadrados

1.64n^2-81x^6 = (8n-9x) (8n-9x)
2.225x^2-400x^2 = (15x-20x) (15x-20x)
3.64m^2-49r^4 = (8m-7r^2) (8m-7r^2
4. ax^2-p^2= (ax-p)(ax-p)
5.16nx^2-100h^2 = (4nx-10h) (4nx-10h)