This one number can tell you whether the solutions to a quadratic equation are real or non-real, and whether they are distinct or repeated.

If the quadratic equation

\[ ax^2 + 2bx + c = 0 \]

has 2 repeated roots, which of the following equations must be true?

If the quadratic \(kx^2-16x+1\) is a perfect square polynomial, what is the value of \(k\)?

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