If the roots of equation \( 2 \mathrm{x}^{2}+k x-8=0 \) are equal and of opposite sign, then the...

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If the roots of equation \( 2 \mathrm{x}^{2}+k x-8=0 \) are equal and of opposite sign, then the value of \( \mathrm{k} \) is-
(a) 0
(b) \( -2 \)
(c) 4
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