Answer:
9a^3 - 3a^2 - 1a + 1
Step-by-step explanation:
A polynomial in standard form has its terms arranged in decreasing order by power of x. Given -3a2 + 9a3 + 1 -a, we rearrange the terms in decreasing order by power of x, obtaining:
9a^3 - 3a^2 - 1a + 1
Notice that the powers of a are in decreasing ordeer: {9, -3, -1, 1}
