[" If the equations "x^(2)+kx+64=0" and "],[x^(2)-8x+k=0" have real roots,then "],[" what is the value of "k" ? "]

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The positive value of k for which the equation x^(2)+kx+64=0 and x^(2)-8x+k=0 will both have real roots,is 4 (b) 8(c)12 (d) 16

Determine the positive values of k for which the equation x^(2)+kx+64=0 and x^(2)-8x+k=0 will both have real roots.