(-6m-n)²

To expand \((-6m - n)^2\), you can use the formula for the square of a binomial, which states that \((a - b)^2 = a^2 - 2ab + b^2\).

In this case, let \(a = -6m\) and \(b = n\).

Now, apply the formula:

\[ (-6m - n)^2 = (-6m)^2 - 2(-6m)(n) + n^2 \]

Calculate each term:

1. \((-6m)^2 = 36m^2\)
2. \(-2(-6m)(n) = 12mn\)
3. \(n^2\)

Putting it all together:

\[ (-6m - n)^2 = 36m^2 + 12mn + n^2 \]

Thus, the expanded form is:

\[ 36m^2 + 12mn + n^2 \]