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Question

1 - 8z3 in the factor form is

A
(1 + 2z)(1 + 2z - 4z2)
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B
(1 + 2z)(1 - 2z + 4z2)
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C
(1 - 2z)(1 + 2z + 4z2)
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D
(1 + 2z)(1 + 2z + 4z2)
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Solution

The correct option is C (1 - 2z)(1 + 2z + 4z2)
1 - 8z3 = (1)3 - (2z)3
= (1 - 2z)(1 + 2z + 4z2)

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