a² - b² = (a+b)(a-b)
(x + 2 + x - 2)(x + 2 - x + 2)=
2x × 4 = 8x
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a² - b² = (a+b)(a-b)
(x + 2 + x - 2)(x + 2 - x + 2)=
2x × 4 = 8x