4
   

Solve 2^x - 4x =0

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ibouvousaime
 
Reply Sun 15 Jun, 2014 02:38 pm
I know 4 is a solution but someone told me there is another one
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Type: Question • Score: 4 • Views: 6,721 • Replies: 4
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bobsal u1553115
 
  1  
Reply Sun 15 Jun, 2014 02:40 pm
@ibouvousaime,
https://duckduckgo.com/ia3/Calculate/MSP/MSP4051ah2250i69db2bbb000017769h81639gdfdf?MSPStoreType=image/gif&s=39
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markr
 
  1  
Reply Sun 15 Jun, 2014 08:14 pm
@ibouvousaime,
If you graph 2^x and 4x, you'll see that they intersect in two places (x=4 and somewhere in the vicinity of x=0.3)
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Stellatyler7
 
  0  
Reply Fri 4 Jul, 2014 05:36 am
@ibouvousaime,
well! You can solve this question as
2^x - 4x =0
2x(x - 4)=0
2x=0 , x - 4 = 0
x = 0 and x = 4
So, the answer 0, 4. Both not 4
engineer
 
  2  
Reply Fri 4 Jul, 2014 05:44 am
@Stellatyler7,
You are confusing 2^x with x^2.
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