Question

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

Answer 1

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