0. Review of Algebra

In Exercises 83–90, perform the indicated operation or operations. (3x+4y)²−(3x−4y)²

In Exercises 121–128, write each English phrase as an algebraic expression. Then simplify the expression. Let x represent the number. A number decreased by the sum of the number and four

Find each product. (x−1)(x+2)

Find each product. (7x+4y)(7x-4y)

Find each product. (x+1)(x+1)(x-1)(x-1)

Find each product. $(a-b)(a^2+ab+b^2)$

Simplify each rational expression. Find all numbers that must be excluded from the domain of the simplified rational expression. $\(\frac{y^2 + 7y - 18}{y^2 - 3y + 2}\)$

Multiply or divide as indicated. $\(\frac{x + 5}{7}\) \(\div\) \(\frac{4x + 20}{9}\)$

Find each product. (x+5)(x−5)

Find each product. (4x²-5y)(4x²+5y)

Find each product : (4x+5)(4x-5)