( m + n )^2 + ( k - 2 n ) * ( 2 n + k )

Question

( m + n )^2 + ( k - 2 n ) * ( 2 n + k )

Answer 1

(m+n)²+(k-2n)*(2n+k)=m²+2mn+n²+(k²+4n²)=m²+2mn+n²+k²+4n²=m²+5n²+2mn+k²