Question

6? (Simplify): (4m + 5n)2 + (5m - 4n)2​

Answer 1

Step-by-step explanation:

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

⇒(4m+5n)2+(5m+4n)2

⇒16m2+25n2+40mn+25m2+16n2+40mn

41m2+41n2+80mn

⇒40(m2+n2+2mn)+m2+n2

⇒40(m+n)2+m2+n2