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Basic operations, simple factors, factor Theorem, Remainder Theorem, Division of polynomials.

If 2- 2x-1 = 16, then the value of x2 is :

Option:
A. 4
B. 9
C. 16
D. 25
Answer: D . 25

Justification:

2- 2x-1 = 16 ↔ 2- 2x/2 = 16 ↔ a - a/2 = 16 ↔ a/2 = 16
↔ a =32 ↔ 2x = 25 ↔ x = 5.
.`. x2 = 52 = 25. 

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