Answer :
[tex]4\times10^5+3\times10^3[/tex]
The given expression is as shown above.
[tex]\begin{gathered} 4\times10^5+3\times10^3 \\ =4\times10^5+0.03\times10^5 \end{gathered}[/tex]Using the distributive property, it follows that the expression becomes:
[tex]\begin{gathered} =(4+0.03)\times10^5 \\ =4.03\times10^5 \end{gathered}[/tex]Therefore, the value of the expression is approximately 4.0 × 10⁵