The given polynomial is:

$2x^5 + 4x^3 - 3x^8$

To write the polynomial in standard form, the terms should be arranged in descending order of their exponents.

So, in this case, the term with the highest power of $x$ is $-3x^8$, followed by $2x^5$, and finally $4x^3$.

The polynomial in standard form is:

$-3x^8 + 2x^5 + 4x^3$

Would you like further details or any additional clarifications?

Here are some related questions to expand your understanding:

1. What is the degree of the polynomial $-3x^8 + 2x^5 + 4x^3$?
2. How do you determine the leading coefficient of a polynomial?
3. Can you explain the difference between a monomial, binomial, and polynomial?
4. What are the steps to factor a polynomial?
5. How can you apply the polynomial in standard form to solve a real-world problem?

Tip: Always check the exponents and arrange terms from the highest to lowest power when converting a polynomial to standard form.