[" (a) "2" or "0],[" 18.If the equation ...

[" (a) "2" or "0],[" 18.If the equation "x^(2)+2(k+2)x+9k=0" has equal roots then "k=?],[[" (a) "1" or "4," (b) "-1" or "4," (c) "1" or "-4," (d) "-1" or "-4],[" then the "," 10"" rean muntion "Ax^(2)-3kx+1=0" has equal roots then "k=?]]

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