SOLUTION: Please help me!!!! Please!! 16. x8 - 16x4 A x4(x - 2)(x + 2)(x2 + 4) B (x4 + 4x2)2 C (x4 - 4x2)2 D (x4 + 4x2)(x4 - 4x2) E x4(x4

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Question 767254: Please help me!!!! Please!!
16. x8 - 16x4
A x4(x - 2)(x + 2)(x2 + 4)
B (x4 + 4x2)2
C (x4 - 4x2)2
D (x4 + 4x2)(x4 - 4x2)
E x4(x4 - 16)
F cannot be factored

17. a4 + 1
A (a2 + 1)2
B (a2 - 1)(a2 - 1)
C a2(a2 + 1)
D (a2 + 1)(a2 - 1)
E a2 (a + 1)2
F cannot be factored

18. 3a4 + 81a
A (a + 3)(a2 + 3a + 9)
B (3a2 + 3)(a2 - 3a + 9)
C (a2 + 3a)(a2 - 3a + 9)
D 3a(a + 3)(a2 - 3a + 9)
E (3a + 3)(a2 + 3a - 9)
F cannot be factored

19. x3 + x2 - x - 1
A (x - 1)(x2 + 2x + 1)
B (x + 1)4
C (x2 + 1)2
D (x + 1)3
E (x - 1)(x + 1)2
F cannot be factored

Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website!
16. x8 - 16x4
A x4(x - 2)(x + 2)(x2 + 4)
B (x4 + 4x2)2
C (x4 - 4x2)2
D (x4 + 4x2)(x4 - 4x2)
E x4(x4 - 16)
F cannot be factored

ans: A x4(x - 2)(x + 2)(x2 + 4)
17. a4 + 1
A (a2 + 1)2
B (a2 - 1)(a2 - 1)
C a2(a2 + 1)
D (a2 + 1)(a2 - 1)
E a2 (a + 1)2
F cannot be factored

ans: F cannot be factored
18. 3a4 + 81a
A (a + 3)(a2 + 3a + 9)
B (3a2 + 3)(a2 - 3a + 9)
C (a2 + 3a)(a2 - 3a + 9)
D 3a(a + 3)(a2 - 3a + 9)
E (3a + 3)(a2 + 3a - 9)
F cannot be factored
ans:D 3a(a + 3)(a2 - 3a + 9)

19. x3 + x2 - x - 1
A (x - 1)(x2 + 2x + 1)
B (x + 1)4
C (x2 + 1)2
D (x + 1)3
E (x - 1)(x + 1)2
F cannot be factored

A (x - 1)(x2 + 2x + 1)

SOLUTION: Please help me!!!! Please!! 16. x8 - 16x4 A x4(x - 2)(x + 2)(x2 + 4) B (x4 + 4x2)2 C (x4 - 4x2)2 D (x4 + 4x2)(x4 - 4x2) E x4(x4 - 16) F cannot be factored 17.