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Posted by **natalie** on Tuesday, September 20, 2011 at 4:27pm.

square root of (2x+1) -5 = 8

I think I take the 5 and add it to the 8 and then I have

square root of (2x+1) = 13

then do I square both sides and end up with 2x+1 = 13^2

2x+1=169

2x+1-1=169-1

2x=168

x=84 am I even close on this?

- pre-calculus -
**Quidditch**, Tuesday, September 20, 2011 at 6:18pmThe best way to check is to substitute your answer back into the equation.

SQRT(2x+1)-5=8

SQRT( (2*84)+1)-5=8

SQRT(168+1)-5=8

SQRT(169)-5=8

13 - 5 = 8

8 = 8

You are correct!

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