Using a suitable identity find : (4x + 5y)²
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Answer:
16x² + 25y² + 40xy
Step-by-step explanation:
=> ( 4x + 5y )² = ( a + b )²
{ where a is 4x and b is 5y }
=> By using this formula -->( a + b )² = a² + b² + 2ab
=> ( 4x + 5y )² = ( 4x )² + ( 5y )² + ( 2 × 4x × 5y )
=> 16x² + 25y² + 40xy
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