Question

(4a+9b) ² + (4a-9b)²​

Answer 1

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Answer 2

Answer:

4a*2 + 9b*2 + 2 x 4a x 9b + 4a*2 +9b*2 - 2 x 4a x 9b

= 16a*2+ 81b*2 + 64ab + 16a*2+81b*2 - 64ab

= 32a*2+ 162b*2

Hope it's helpful to you.

According to my point of view this is the correct answer.