Home » GMAT » If 3x + 1 = 81, then x 1 =
If 3x + 1 = 81, then x 1 =
A. 2
B. 3
C. 4
D. 9
E. 27
Correct Answer: A
Explanation/Reference:
Explanation:
Solve for x first. Since 3x+1 = 81, and 81 is 34, make an easier equation just based on the exponents. This would be x + 1 = 4. x = 3. Therefore, x 1 = 3 1 = 2.
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