Factor problems 5 - 8 by grouping.

5. x2 – 2x + 1

A(x – 1)(x – 1)
B(x – 1)(x + 1)
C(x + 1)(x – 1)
D(x + 1)(x + 1)
E (x + 2)(x – 1)
F This polynomial cannot be factored by grouping.

Factor problems 13 - 16 by using the perfect squares method.

13. x^2 – 14x + 49

A(-x – 7)(-x – 7)
B(x + 7)(x – 7)
C(x + 7)(x + 7)
D(x – 7)(x + 7)
E (x – 7)(x – 7)
F This polynomial cannot be factored by using the perfect squares method.

14. x^2 + 18x + 81

A(x + 9)(x + 9)
B(-x + 9)(-x + 9)
C(x - 9)(x - 9)
D(x + 9)(x - 9)
E (x - 9)(-x + 9)
F This polynomial cannot be factored by using the perfect squares method.

15. x^2 – 3x + 16

A(x – 4)(x – 4)
B(x – 4)(x + 4)
C(x + 4)(x + 4)
D(x + 4)(x – 4)
E (-x – 4)(-x – 4)
F This polynomial cannot be factored by using the perfect squares method.

16. 4x^4 – 20x^2 + 25

A(2x^2 + 5)(2x^2 + 5)
B(2x^2 – 5)(2x^2 + 5)
C(-2x^2 – 5)(-2x^2 – 5)
D(2x^2 – 5)(2x^2 – 5)
E (2x^2 – 5)(-2x^2 + 5)
F This polynomial cannot be factored by using the perfect squares method.