Algebra-1

To expand and simplify (9ab - 4)(9ab + 4), we can use the formula for multiplying binomials:

(a + b)(a - b) = a² - b²

In this case, a is 9ab and b is 4. Substituting these values into the formula, we get:

(9ab - 4)(9ab + 4) = (9ab)...