Question

What is (3 m 2 n + m²) - (n-3m²n )?​

Answer 1

$refer \: to \: the \: attachment$

Answer 2

Step-by-step explanation:

(3m−2n)(2m−3n)

at [m=1] & [n=−1]

now

=[3×1−2(−1)][2×−3(−1)]

[3+2][2+3]

5×5

=25