# How you do cubic? $$\pm$$

Given that $$s$$ and $$t$$ equals

and $$p$$ and $$q$$ such that

Manipulating a little bit, $$T$$ should become

See how $$T$$ and $$S$$ have a $$\pm$$ in them? When you subtract $$s$$ from $$t$$, why does that $$\pm$$ disappear, and does it equal to the same value as when they have the $$\pm$$ sign in them?

If you want to see this website, it is: Deriving the Cubic Formula

Note by Bloons Qoth
2 years ago

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Yup, a simpler way to prove that cubic formula is to first depress the cubic polynomial. Cardano's method shows a good illustration of this.

- 2 years ago

Do you see the last 2 pictures? I was wondering what method allows you to get rid of that $$\pm$$ sign.

- 2 years ago