(1) (4m + 5n)? + (5m + 4n)? – InterviewSolution

1.

(1) (4m + 5n)? + (5m + 4n)?

Answer»

We know that (a+b)^2= a^2+b^2+2abso

Using (a+b)^2 = a^2+b^2+2ab

= 16m^2 + 25n^2+ 40mn + 25m^2 + 16n^2 + 20mn

=41m^2 + 41n^2 + 60mn

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