find factors X + 4 ka whole square minus x + 8 ka whole square
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(x+4)²-(x+8)²
=x²+4²+2(x)(4)-[x²+8²+2(x)(8)]
=x²+16+8x-x²-64-16x
=(-48)+(-8x)
=(-8x)+(-48)
=[-8(x+6)]
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