Five mark example problem II — task. Mathematics State Board, Class 10.

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Find the values of \(k\) such that the quadratic equation \((k + 9)x^2 + (k + 1)x + 1 = 0\) has no real roots.

Answer:

\(k =\)

\(-5 > k < 7\)
\(-5 < k < 7\)
\(5 < k < -7\)
\(5 < k < 7\)

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