Question 51437
If the square root of something is 8, that means the something must be 64 because 8*8=64.  The something in this case is {{{x^3}}}, which means {{{x^3=64}}}.  That means we need to find the cube root of 64; i.e., some number multiplied by itself three times is equal to 64.  To do that:
*[invoke explain_simplification "x^3=64"]