Solve:
$k^{2} + k - 2 = 0$ .

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Solution

Now,
$k^{2} + k - 2 = 0$
or, $k^{2} + 2 k - k - 2 = 0$
or, $k (k + 2) - 1 (k + 2) = 0$
or, $(k + 2) (k - 1) = 0$
or, $k = - 2, 1$ .

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