3. Factorise:
16 - (x2 + 4x + 4)
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16-(x2+4x+4)(given in the question)
16-(x2+2x+2x+4)
16-(x(x+2)+2(x+2))
16-((x+2)(x+2))
16 (-(x+2)(x+2))
16 (x-2)(x+2)
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