Question

Expand: (5 + 6
$(5x + 6y) {}^{2}$​

Answer 1

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Using identity, ( a² + b² ) = a² + b² + 2ab

Here,

• 5x = a
• 6y = b

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• Now, ( 5x² + 6y² )
• = (5x)² + (6y)² + 2.5x.6y
• = 25x² + 36y² + 60xy

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