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

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How you do cubic? \(\pm\)

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