Question

Помогите подалуйста !"!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

$\frac{1}{49}x^{2}-\frac{16}{169}y^{2}=(\frac{1}{7}x)^{2}-(\frac{4}{13}y)^{2}=(\frac{1}{7}x-\frac{4}{13}y)(\frac{1}{7}x+\frac{4}{13}y)$