Dat destroyer QR problem 34

[RYost234]

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Sqrt x + 5 = x + 1

I understand that x can be 4 or -1, but what is the next step to determine which number x is?

 

[lwergod]

is it actually x^1/2 or (x+5)^1/2? (on the left side)

 

[RYost234]

(x+5)^1/2, sorry for not clarifying originally