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