Solve x2 – 64 = 0. 1. isolate x2: x2 = 64 2. apply the square root property of equality: 3. isolate the variable: x= ? x=?

Your steps are correct. To isolate the variable, you need to square root both sides, and it's worth noting that every positive number has two solutions to its roots: a positive number and a negative number.
For example, sqrt64 is not on 8, but -8 as well because -8 × -8 = 64
Therefore, x= 8 and x= -8