if e repersents the something of logarithms then I memorised e to 16 digits:2.718281828459045...
so that number^2-x^2=0.23 number squred=aprox 7.38906 7.38906-x^2=0.23 subtract 7.38906 forom both sides -x^2=-7.15906 multiply negative x^2=7.15906 squre root 2.67564=x
