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avatar+243 

The answer is not (-1/2, 1/10). Thank you!

 May 14, 2020
 #1
avatar
0

The answer is (-1/10, 1/10).

 May 14, 2020
 #3
avatar+23550 
+1

2u       u  cannot equal or be less than - 1/2   because    2(-1/2) = -1

-20 u   u cannot equal or be MORE  than   1/20  because  -20 ( 1/10) = -1

 

 

[-1/2, 1 /20]     edited    sorry for the math error

ElectricPavlov  May 14, 2020
edited by ElectricPavlov  May 14, 2020
 #2
avatar+29978 
+3

If u >= -1/2 then 2u is not in the interval 

If u <= 1/20 then -20u is not in the interval

 

So we must have  u in the interval [-1/2, 1/20]

 May 14, 2020

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