Using the identity :(a-b) ²=a²-2ab+b²
a) (5x-4y) ²
please help me
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Answer:
Step-by-step explanation:
We know, (a + b)² = a² + b² + 2ab
Applying formula,
(5x)² + (4y)² + 2 { 5x × 4y}
25x² + 16y² + 40xy
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