Question

3mn²+4m²n²+(5mn)²+(-mn²)

Answer 1

$3m {n}^{2} + 4 {m}^{2} {n}^{2} + ( {5mn)}^{2} + ( - m {n}^{2} ) = 3m {n }^{2} + 4 {m}^{2} {n}^{2} + 25 {m}^{2} {n}^{2} - m {n}^{2} \\ = 2m {n}^{2} + 29 {m}^{2} {n}^{2}$

Answer 2

=3mn²+4m²n²+5m²n²-mn²

=2mn²+9m²n²

this is the answer