Algebra-1

To simplify (7xy + 4y)², we can use the formula for the square of a binomial:

(a + b)² = a² + 2ab + b²

In this case, a is 7xy and b is 4y. Substituting these values into the formula, we get:

(7xy + 4y)² = (7xy)² + 2(7xy)(4y) + (...