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4-82.

Remember the rule (a + b)(ab) = (a2b2).

(2x + 3y)(2x − 3y)

Remember to remove common factors.

2x3(4 − x4)

2x3(2 − x2)(2+ x2)

See part (a).

See part (b).

The pattern for parts (a) through (c) is that they contain a difference of squares.