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-2x^2 + 242 = 0 

 Sep 27, 2017
 #1
avatar+100587 
+1

-2x^2 + 242  = 0      divide through by  -2

 

x^2 - 121   =  0       add 121 to both sides

 

x^2  = 121   take positive / negative  roots

 

x  = ±√121

 

x  = ±11

 

 

 

cool cool cool

 Sep 27, 2017

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