If 2^(x – 1) + 2^(x + 1) = 320, find x.

A5

B6

C7

D8

Explanation

Factor out 2^(x-1): 2^(x-1) [1 + 2^2] = 320 => 5 * 2^(x-1) = 320 => 2^(x-1) = 64 = 2^6 => x – 1 = 6 => x = 7.

Exam Relevance

Topic: Algebra
Subtopic: Exponents

Submitted by: mcqstutor Team More Mathematics MCQs →