v2x+2-3=15

Question

Hi

Eliminate the radical by squaring both sides,And I don't know how to do it.Thank you

Answer 1

It's not clear from how you wrote it, what the original expression looks like.

 

Is it √(2x + 2) - 3 = 15?

 

If so...  In order to use the technique of squaring both sides, you have to get the radical by itself on one side.

 

So first add 3 to both sides to get rid of the -3 term.

 

That gives you

 

√(2x + 2) = 18

 

NOW square both sides:

(2x + 2) = 18² = 324

2x + 2 = 324

 

Solve the rest of the way:

2x = 322

x = 161