Question

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(5a-3a^3)*(4a-1)

Answer 1

`-12a^(4) + 3a^(3) + 20a^(2) -5a`

Explanation:

`(5a-3a^(3) )` •
`(4a-1)`

Let's use FOIL (first, outer, inner, last) to solve this. We'll multiply the terms by one another in that fashion.

`20a^(2) - 5a - 12a^(4) + 3a^(3)`

Rearrange in decreasing exponents.

`-12a^(4) + 3a^(3) + 20a^(2) -5a`