4-9= - (2+3)(2-3), 144-64= - (12-8)(12+8), 64x-16y+32z= - 8(8x-2y+4z), e²-18e+81= - (e-9)², b²+6b-16= - (b+8)(b-2), 6k²-5k-6= - (2k-3)(3k+2),

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