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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