Помогите решить 9/25x^2-4/49y^2

Question

Помогите решить 9/25x^2-4/49y^2

Answer 1

A² -b² =(a -b)(a +b)

9/25 =(3/5)²
4/49 =(2/7)²


9/25x² -4/49y²=(3/5x -2/7y)(3/5x +2/7y)