Factor {9x}^(2) - {25y}^(2)

Question

Factor

`{9x}^(2) - {25y}^(2)`

Answer 1

`\text{Use}\ (a-b)(a+b)=a^2-b^2\\\\9x^2-25y^2=(3x)^2-(5y)^2=(3x-5y)(3x+5y)`