x-2y-3z whole square
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Answer:
(a-b-c)² = a²+b²+c²-2ab-2ac+2bc
= (x-2y-3z)²
= x²+(2y)²+(3z)²-2×x×(-2y)-2×x×(-3z)-2×(-2y)×(-3z)
= x²+4y²+9z²-4xy -6xz +12yz
so (x²+4y²+9z²-4xy -6xz +12yz) is the answer
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