(4-b)(4+b) - 16-b2, (b-4)(b+4) - b2-16, (c-7)(c+7) - c2-49, (7-c)(7+c) - -c2+49, (2x-5)(2x+5) - 4x2-25, (5-2x)(5+2x) - -4x2+25, (9c-8d)(9c+8d) - 81c2-64d2, (8d-9c)(8d+9c) - -81c2+64d2,

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