Algebra-1

To simplify (-3x²y - 7xy)², we can use the formula for the square of a binomial:

(a - b)² = a² - 2ab + b²

In this case, a is -3x²y and b is 7xy. Substituting these values into the formula, we get:

(-3x²y - 7xy)² = (-3x²y)² - 2(-3x²y)(7xy) + (7xy)²
                =  9x⁴y²+42x³y²+49x²y²

Therefore, the simplified form of (-3x²y - 7xy)² is

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