1.

Use suitable identity, simply (5a+4b)+(5a+4b)​

Answer»

ong>Answer:

25a² + 16b² + 40ab

Step-by-step EXPLANATION:

Identity used – (a+b)² = a² + b² + 2ab

(5A+4B) × (5a+4b)

= (5a+4b)²

= (5a)² + (4b)² + 2(5a)(4b)

= 25a² + 16b² + 40ab



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