# Why should I use b^2-4ac in this question?

**Question description**

Why should I use b^2-4ac in this question

For what value(s) of p does the equation x^2 + (x/p) + 1 = 0 have equal roots?

And when should I know to use this formula? I know how to work this question out, I just get confused as to when I am supposed to use the formula, if its pointed out I am fine.

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