Homework Help: pre-calculus

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

Could someone please help me with this problem?
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 6:18pm
The 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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