# SOLUTION: Which number is not real? 1.) -8 2.) sqrt(-64) 3.) - sqrt(64) 4.) 3 times sqrt(-64) I already eliminated -8 and - sqrt(64) beacause I know they are real, I just don't unders

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 Question 414406: Which number is not real? 1.) -8 2.) sqrt(-64) 3.) - sqrt(64) 4.) 3 times sqrt(-64) I already eliminated -8 and - sqrt(64) beacause I know they are real, I just don't understand the other two. Please help, Thank you!Answer by josmiceli(9817)   (Show Source): You can put this solution on YOUR website!2) and 4) are not real because they both have in the expressions ---------- 2) ---------- 4)