Expand (2a +5b-4c)²
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( 2A - 5B - 4C )²
=> { 2A + ( -5B) + ( -4C) }²
As we know that,
( A + B + C)² = ( A)² + ( B)² + (C)² + 2AB + 2BC + 2CA.
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=> ( 2A)² + (-5B)² + ( -4C)² + 2 × 2A × ( -5B) + 2 × (-5B) × (-4C) + 2 × (-4C) × ( 2A)
=> 4A² + 25B² + 16C² - 20AB + 40BC - 16CA.
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