Question

m²+n²-3mn -n²+3m²-4mn

Answer 1

Explicación paso a paso:

=m2+n2+−3mn+−n2+3m2+−4mn

=(m2+3m2)+(−3mn+−4mn)+(n2+−n2)

=4m2+−7mn

solución:

=4m2−7mn