Everyone knows the quadratic formula, but what happens when pupils ask about a formula for solving cubics? A formula does exist, but it's a bit more complicated. It's given here, as a simple formula and also explained with an example.


  • A-formula-for-cubic-equations.pdf

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Created: Jan 12, 2017

Updated: Apr 8, 2017

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2 Reviews

  • 5

    Nicely put together, a small group of students a year will benefit from this at our school.

  • 4
    user avatarDaveGale5 months agoreport

    This is a really nice extension activity (you'll know the right students for this). Also provides an opportunity for a pretty complicated substitution into expressions too.