1.   Factor x2 – 16.
    A. (x – 4)(x – 4) B. (x + 2)(x – 8)
    C. (x + 4)(x + 4) D. (x + 4)(x – 4)
    Hint

  2.   Factor r4 – 81.
    A. (r2 + 9)(r + 3)(r - 3) B. (r2 + 9)(r2 + 9)
    C. (r + 3)2(r + 3)2 D. prime
    Hint

  3.   Factor 7xy2 - 28x3
    A. 7x(y + 2x)(y - 2x) B. 7x2y2(1 + x)
    C. (7xy + x)(y – 28x2) D. prime
    Hint

  4.   Factor x2 – 8x + 16.
    A. (x + 4)(x – 4) B. (x - 8)2
    C. (x + 4)2 D. (x - 4)2
    Hint

  5.   Factor 4x2 – 49.
    A. B.
    C. (2x + 7)(2x – 7) D.
    Hint