In Problems 2330, multiply mentally. a. C. (c + 1)(c-7) (2x + 1)(x - 1) b. (z

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In Problems 23–30, multiply mentally.

a. C. (c + 1)(c-7) (2x + 1)(x - 1) b. (z - 3)(z + 5) (2x - 3) (x - 1)

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