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plz mark me brainliests
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Step-by-step explanation:
2)(x-2y-3z)
=({x-2y}-3z)²
=(x-2y)²-2.x.2y+(3z)²
=(x)²-2x.2y+(2y)²-2x.2y+(3z)²
=x²-4xy+4y²-4xy+9z²(ans)
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