Expression 3: "x" squared plus left parenthesis, "y" , right parenthesis squared equals "a" left parenthesis, 1 minus "z" , right parenthesis "z" to the 4th power times "n"x2+y2=a1−zz4·n
3
Expression 4: "a" equals 1.4 1 7a=1.417
4
Expression 5: "x" squared plus "y" squared equals negative "a" left parenthesis, 1 minus "z" , right parenthesis "z" to the 4th power times "n"x2+y2=−a1−zz4·n