Expand it (a-2b-3c)²
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=>(A-2B-3C)²
=> {(A) + (-2B) + (-3C)}²
we know that,
(A+B+C)² = A²+B² + C² + 2AB + 2BC + 2AC.
=> (A)² + (-2B)² + (-3C)² + 2 × A × (-2B) + 2 × (-2B) × (-3C) + 2 × (-3C) × (A)
=> A² + 4B² + 9C² -4AB + 12BC - 6AC.
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