What is the value of x? (1) 4x+1 + 4x = 320 (2) x2 = 9

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问题 What is the value of x?
(1) 4^x+1 + 4^x = 320
(2) x² = 9

选项 A、Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B、Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C、BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D、EACH statement ALONE is sufficient.
E、Statements (1) and (2) TOGETHER are NOT sufficient.

答案A

解析 Determine the value of x.
(1) If 4^x+1 + 4^x = 320, then 4^x(4 + 1) = 320, from which 4^x = 64 and x = 3; SUFFICIENT.
(2) If a² = 9, then x = -3 or x = 3; NOT sufficient.
The correct answer is A；
statement 1 alone is sufficient.

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What is the value of x? (1) 4x+1 + 4x = 320 (2) x2 = 9

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