Scientific notation is form [tex]a * 10^{x} [/tex], where 1 ≤ a < 10. So, you have to write like this:
[tex]0.0000431 = 0.000431 * 0.1 = ... = 4.31 * 0.00001 = 4.31 * 10^{-5} [/tex]
since [tex]0.00001 = 10^{-5} [/tex]
So, the answer is [tex]4.31 * 10^{-5}[/tex]
