4+9(x-y)²+12(x-y)

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4+9(x-y)²+12(x-y)

4+9(x-y)²+12(x-y)
4+9(x-y)²+12(x-y)

4+9(x-y)²+12(x-y)
4+9(x-y)²+12(x-y)
=9(x-y)²+12(x-y)+4
=[3(x-y)+2]²
=(3x-3y+2)²