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lf the equation x2-kx +49=0 has only one root in R then k-..........(A) 1474.(B) -14(C) 8(D) -8 |
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Answer» for only 1 root D = 0 => (-k)²-(4*1*49) = 0=> k²-196 = 0=> k² = 196=> k = ±14 it is wrong |
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