Could you help me with this?

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Thank-you

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Add -1 to both sides to get the radical 
term alone on the left:

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Square both sides of the equation:

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 = 

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Switch left and right sides for convenience:

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Get 0 on the right 

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Factor left side by thinking of two whole numbers
which have product 65 and sum 66, whch are 65 and 1:

 = 0

Set each factor = 0

 gives 

 gives 

However we must check these answers because radical
equations often have extraneous answers, which are
not solutions.  

Checking 

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 = 

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So we know  is a valid solution.

Checking 

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So as it turns out, both  and 
are valid solutions.

But be aware that this is not always the case.
Sometimes when you get two answers, one of them
will be a solution and the other will not check,
and thus must be discarded; sometimes neither one 
is a solution and the equation has no solution.
Just be sure to ALWAYS CHECK a RADICAL EQUATION.

Edwin