Asked by lindsay
Show that 4/2^x = 2^2-x and hence or otherwise solve for x in the equation 2^x +2^x-2 =5
Answers
Answered by
Steve
4 = 2^2
4/(2^x) = (2^2)/(2^x) = 2^(2-x)
Now, just solve the equation. Hint: 2^(x-2) = 2^x / 4
4/(2^x) = (2^2)/(2^x) = 2^(2-x)
Now, just solve the equation. Hint: 2^(x-2) = 2^x / 4
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