4(x-y)2 - 12 (x-y) +9
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4(x-y)2-12(x-y)+9
=8(x-y)-12(x-y)+9
=8x-8y-12x+12y+9
=-4x+4y+9
=8(x-y)-12(x-y)+9
=8x-8y-12x+12y+9
=-4x+4y+9
stargirl11:
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