Algebra-1

To simplify (-3m²n² - 3m³n)², we can use the formula for the square of a binomial:

(a - b)² = a² - 2ab + b²

In this case, a is -3m²n² and b is 3m³n. Substituting these values into the formula, we get:

(-3m²n² - 3m³n)² = (-3m²n²)² - 2(-3m²n²)(3m³n) + (3m³n)²
                =  9m⁴n⁴ + 18m⁵n³ + 9m⁶