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(x-y) ² - m²
(x-y + m) (x-y-m)
a² - 4a + 4 - y²
(a-2)²-y²
(a-2+y)(a-2-y)
n² - 16n +64 -b²
(n-8)² - b²
(n-8+b)(n-8-b)
25 - x² + 4x - 4
5² - (x² - 4x+4)
5² - (x-2)²
(5-(x-2)(5+(x-2))
(5 - x+2)(5+x-2)
4x² + 16b² +12xy - 40ab + 9y² + 25a²
4x² +12xy +9y² +25a² - 40ab+16b²
(2x +3y)²+ (5a - 4b)² queda ahí