How would you solve.... (Square roots, finding zero)

[TheKeyboardist]

Because of my test tomorrow, ive been going through the review section in preparation. However, I came across a problem that stumped me. The purpose is to find the zeroes:

sqrt(x^2-4)=0

I could get it down to

sqrt((x-2)(x+2))=0 but cant figure anything else. Any help would be appreciated. Thanks.

 

[tkhunny]

What happes if you square both sides, first?

Don't forget to check your answers before you think you are done.

 

[TheKeyboardist]

My mistake, it just says to find the domain, no "=0".

Thanks for the reply.

 

[tkhunny]

What did you get?

 

[TheKeyboardist]

x has to be greater than or equal to 2 because anything lower would result in a negative number.

 

[skeeter]

what about values of x such that x < -2 ?