Question

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

Answer 1

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

Answer 2

25a²+16b²+ 40 ab is the right answer