−m^2+9mn^2

To simplify the expression \(-m^2 + 9mn^2\), we can factor out the common term.

Both terms \(-m^2\) and \(9mn^2\) have a common factor of \(-m\):

1. Rewrite the expression: \[ -m^2 + 9mn^2 = -m(m) + 9mn^2 \]

2. Factor out the common term \(-m\): \[ = -m(m - 9n^2) \]

So, the factored form of the expression is: \[ -m(m - 9n^2) \]

This is the simplified or factored version of the expression \(-m^2 + 9mn^2\). If you need anything further or another kind of assistance, feel free to ask!