What is the simplest form of this expression? - x^3 (5x+1) + 4x^4

-x^3 * (x + 1)

Step-by-step explanation:

Perform the indicated multiplication and then write out all the terms in descending order by powers of x:

-x^3 (5x+1) + 4x^4 = - 5x^4 - x^3 + 4x^4

= - x^4 - x^3, or = - x^3 * (x + 1)