Anyone who can solve this.. Maths Problem ??

[Aahliya]

can anyone solve this question for me.. pls ??

M/J 2010 (9709/32)

1 Solve the equation
2^x+ 1/2^x− 1= 5,
giving your answer correct to 3 significant figures. [4]

 

[Zephyro]

2^x + 1 = 5 * 2^x -5

2^x = u

u + 1 = 5u -5

u = 6/4

2^x = 6/4

x = 0.585