What is the discriminant of $y=x^2-6x+9$ and what does that mean?

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Answer 1 · 2015-07-26T17:41:20

$y = x^2 - 6x + 9$

Ans: #y = (x - 3)^2@

$D = b^2 - 4ac = 36 - 36 = 0.$ This means there is a double root
at x = 3.
In fact, this function y is in the form $y = (x - 3)^2.$

What is the discriminant of y=x^2-6x+9y=x^2-6x+9 and what does that mean?