Correct Answer: 7
Explanation:
∵ 2x - 1 + 2x + 1 = 320
Apply the law of Algebra
⇒ 2x - 1(1 + 2 2 ) = 320
⇒ 2x - 1(1 + 4 ) = 320
⇒ 2x - 1 x 5 = 320
⇒ 2x - 1 = 64 = 2 x 2 x 2 x 2 x 2 x 2
⇒ 2x - 1 = 26
if pX = pY then X will be equal to Y. means X = Y;
⇒ x - 1 = 6
∴ x = 7
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