Leti T.

asked • 09/11/13

solve 2^(2x+1)-2^x=3

Solve for x

Kim Z.

Leti, 
 
Do you mean:
2(2x+1) - 2x = 3 ??
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09/11/13

1 Expert Answer

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Robert J. answered • 09/11/13

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Certified High School AP Calculus and Physics Teacher

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Hi Leti,
I am from Scottsdale too.
 
Let u = 2x, while u > 0
2u^2 - u - 3 = (2u-3)(u+1) = 0
So, u = 3/2 = 2x
x = log(base 2) (3/2) <=Answer
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Parviz F.

log 2 (3/2 ) :

 2x  = 3/2

X (lof 2 ) = log 3/2 = log 3 - log 2

 X = ( log 3 - log 2) / log 2 = -0.52

     

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09/13/13

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