162 x 1019 x2 0168xSolution162 x 1019 x2 0168x 162101901

1.62 x 10^-19 = x^2 / 0.168-x

1.62 x 10^-19 = x^2 / (0.168-x)

1.62*10^-19(0.168 -x) = x^2

x^2 = 0.2016*10^-19 - 1.62*10^-19x

x^2 +1.62*10^-19x -0.2016*10^-19 =0

solve the quadratice equation :

multiply the equation by 10^19:

10^19x^2 +1.62x - 0.2016 =0

Use the quadratice formula: x = ( -1.62 +/ sqrt( 1.62 +4*0.2016*10^19) )/2*10^19

= ( -1.62 +/- 2870540018.88)/2*10^19

x = 1.43*10^-10 , - 1.43*10^-10