Final answer:
The standard form of the given polynomial is rearranged in descending powers of x as -5x^4 + 8x^3 - 2x + 1.
Step-by-step explanation:
To rewrite the given polynomial 1-2x-5x4 + 8x3 in standard form, we need to arrange the terms in order of descending powers of x.
So, the standard form of the polynomial will be -5x4 + 8x3 - 2x + 1.