Expression 1: 1 half left parenthesis, "x" to the 4th power plus "y" to the 4th power plus "z" to the 4th power , right parenthesis minus 8 left parenthesis, "x" squared plus "y" squared plus "z" squared , right parenthesis plus 60 equals 012x4+y4+z4−8x2+y2+z2+60=0