1.

lf the equation x2-kx +49=0 has only one root in R then k-..........(A) 1474.(B) -14(C) 8(D) -8

Answer»

for only 1 root D = 0

=> (-k)²-(4*1*49) = 0=> k²-196 = 0=> k² = 196=> k = ±14

it is wrong



Discussion

No Comment Found