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z² - 4 = (z - 2) (z + 2)
a² - 122 = (a - 11) (a + 11)
x² - 9 = (x - 3) (x + 3)
a² - 16 = (a - 4) (a + 4)
x^4 - 4 = (x^2-2)(x^2+2)
4x^2-16 = (2x-4)(2x+4)
x^2-64 = (x-8)(x+8)
9x^2-144 = (3x-12)(3x+12)
Ahi estan los 5 ejemplos