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if

x^2 = 4

what is x?

Guest May 7, 2017
 #1
avatar+90048 
+2

 

x^2  =  4   subtract 4 from both sides

 

x^2 - 4  =  0       factor

 

(x + 2) (x - 2)  =   0

 

Set  both factors to 0

 

x + 2  = 0                                                   x - 2  =  0

 

subtract 2 from both sides                      add 2 to both sides

 

x =  -2                                                        x  =  2

 

And those are the two solutions

 

 

 

cool cool cool

CPhill  May 7, 2017
 #2
avatar+28 
+1

Because it is x² = 4 this means to get a singular x you'd square root it (√4)

and the answer will equal = 2

Japhiru  May 7, 2017

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