Question

(iv) (4m + 5n)2 + (5m + 4n)2​

Answer 1

(4m + 5n)2 + (5m + 4n)2

8m + 10n + 10m + 8n

18m + 18n

18(m+n)

Answer 2

Here is your solution÷

(4m+5n)^2 + (5m+4n)^2

=(16m^2 + 25n^2 +40mn)+(25m^2 + 16n^2 + 40mn)

since- (a+b)^2=a^2+b^2 +2ab

=16m^2 + 25m^2 + 25n^2 + 16n^2 + 40mn + 40mn

=41m^2 + 41n^2 + 80mn

please mark as brainliest.