**Factor.**

21) (x + 6)^{2} – 49

A) (x + 13) (x – 1)

B) x^{2} + 12x – 13

C) (x + 1) (x – 13)

D) (x + 55) (x – 43)

22) (x – 6)^{2} – 64

A) (x + 2) (x – 14)

B) (x – 14)^{2}

C) (x + 58) (x – 70)

D) (x – 2) (x + 14)

23) (x – 7)^{2} y^{2}

A) (x – 7 – y)^{2}

B) (x – 7 + y)^{2}

C) (x – 7 + y) (x + 7 – y)

D) (x – 7 + y) (x – 7 – y)

24) (2x + y)^{2} – 25

A) (2x + y – 5)^{2}

B) (2x + y + 5)^{2}

C) (2x + y + 5) (2x + y – 5)

D) prime polynomial

**You can factor completely.**

25)^{4} – 81

A) (x^{2} + 9) (x + 3) (x – 3)

B) (x^{2} + 9) (x – 3)^{2}

C) (x + 3)^{2} (x – 3)^{2}

D) (x^{2} + 9) (x^{2} – 9)

26) 64x^{2} + 25

A) (8x + 5) (8x – 5)

B) (8x + 5)2

C) (8x – 5)2

D) prime polynomial

27) 3xy^{2} – 147x

A) 3x(y + 7)^{2}

B) 3x(y + 7) (y – 7)

C) 3x(y – 7)^{2}

D) prime polynomial

28) 50x^{2}Y–8y

A) 2y(5x + 2)^{2}

B) 2y(5x + 2) (5x – 2)

C) 2y(5x – 2)^{2}

D) prime polynomial

29.^{2} – 2x+1 – y^{2}

A) (x + 1 – y)^{2}

B) (x – 1 + y) (x – 1 – y)

C) (x + 1 + y) (x + 1 – y)

D) (x – 1 – y)^{2}

30) 49x^{2} + 56x + 16 – z^{2}

A) (7x – 4 – z)^{2}

B) (7x – 4 + z) (7x – 4 – z)

C) (7x + 4 + z) (7x + 4 – z)

D) (7x + 4 – z)^{2}

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