This expansion is incorrect. Let's correct it:
(3x - 5)(3x + 5) = 9x^2 + 15x - 15x - 25= 9x^2 - 25
Therefore, the correct expansion of (3x - 5)(3x + 5) is 9x^2 - 25.
This expansion is incorrect. Let's correct it:
(3x - 5)(3x + 5) = 9x^2 + 15x - 15x - 25
= 9x^2 - 25
Therefore, the correct expansion of (3x - 5)(3x + 5) is 9x^2 - 25.