How do I factor b^3(a^3b^3 - 1)?

Answer 1

The b^3 is already factored out. For the term in parentheses, make use of the fact that
x^3 -1 = (x - 1)(x^2 + x + 1)
and substitute ab for x.

Answer 2

so is this the answer?

Answer 3

No. It will be the answer when you combine the steps as I described.

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Answer 4

-5x-y=21