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x² - 25
Yes — It factors as (x - 5)(x + 5)
x² + 36
No — It's a sum of squares, not a difference.
9y² - 1
Yes — It factors as (3y - 1)(3y + 1)
4x² - 49
Yes — It factors as (2x - 7)(2x + 7)
x² - 6x
No — It is not in the form a² - b².
16a² - 81b²
Yes — It factors as (4a - 9b)(4a + 9b)
25x² + 36
No — It's a sum, not a difference.
49 - y²
Yes — It factors as (7 - y)(7 + y)
36x² - 49
Yes — It factors as (6x - 7)(6x + 7)
x² - 1
Yes — It factors as (x - 1)(x + 1)
