Question

(4m+5n)2+(5m+4n)2-(4m+5n) (4m-5n)​

Answer 1

Answer:

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

8m+10n+10m+8n-(4m^2-5n^2)

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

8m+10m+8n+10n-16m^2+25n^2

18m+18n-16m^2+25n^2

18m-16m^2+25n^2+18n ans

so it will help you

Answer 2

(4m+5n)²+(5m+4n)²-(4m+5n)(4m-5n)

= 16m²+25n²+40mn+25m²+16n²+40mn-(16m²-25n²)

= 16m²+25n²+40mn+25m²+16n²+40mn-16m²+25n²

=25n²+40mn+25m²+16n²+40mn+25n²

= 66n² +25m²+80mn