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3-29.
  1. Factor each expression completely. Homework Help ✎

    1. x2 − 49

    2. 4x2 − 1

    3. x2y2 − 81z2

    4. 2x3 − 8x

(x + 7)(x − 7)

(xy + 9z)(xy − 9z)

Remove the common factor and then factor the quadratic.