x2 - 25 - (x - 5)(x + 5), y2 - 49 - (y - 7)(y + 7), c2 - 64 - (c - 8)(c - 8), 16 - x2 - (4 - x)(4 - x), w2 - 100 - (w - 10)(w - 10), x2 - 900 - (x - 300)(x + 300), 81 - x2 - (9 - x)(9 + x), a2 - c2 - (a - c)(a + c), 100 - 81x2 - (10 - 9x)(10 + 9x), 49x2 - 16 - (7x - 4)(7x + 4), 9x2 - 4y2 - (3x - 2y)(3x + 2y), 36a2 - c2 - (6a - c)(6a + c), 225 - 121y2 - (15 - 11y)(15 + 11y),

Difference of two squares

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