+0  
 
+1
53
3
avatar+70 

What interval consists of all u such that neither 2u nor -20u is in the interval (-infinity, -1) ?

 May 13, 2022
 #1
avatar
-1

The answer is (-1/20, 1/2).

 May 13, 2022
 #2
avatar+70 
+1

But isn't -20*1/2=-10? That falls into the interval, which we don't want.

idontknowhowtodivide  May 13, 2022
 #3
avatar+70 
+1

I got the answer as [-1/2, 1/20]. 

 May 13, 2022

8 Online Users

avatar