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7-77.
  1. Simplify the following expressions. Homework Help ✎

    1. 15x2 − 3x(4 + 5x)

    2. 1/3(24x − 9) + 10

    3. (x − 3)(x + 1) + 2x

    4. 6x − 2 + 9 − 3yx

Distribute to remove the parenthesis.
15x2 − 12x − 15x2
Add like terms.
12x

Follow the steps outlined in part (a).

Start with a generic rectangle to simplify, then use the same method as part (a).

x2 − 3

Use the strategy shown in part (a) to solve this problem.