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MHF4UPolynomial Equations

To fully factor: 216 − (x + 4)³, we treat it as a difference of cubes: a³ − b³. We need both terms written as perfect cubes.

=6³ − (x + 4)³

you: how do I know to use difference of cubes?

Good question. (x + 4)³ being cubed is the clue we need difference of cubes, so 216 has to be a cube too. Run through small cubes: 1³ = 1, 2³ = 8 6³ = 216, and there it is.

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