" 12.For "x in R," the expression "(x^(2)+2x+c)/(x^(2)+4x+3c)" can take all real values if "c in:

If x in R then (x^(2)+2x+a)/(x^(2)+4x+3a) can take all real values if

If x in R then (x^(2)+2x+a)/(x^(2)+4x+3a) can take all real values if

If x is real then (x^(2)-x+c)/(x^(2)+x+2c) can take all real values if

Find the interval in which .'m' lies so that the expression (mx^(2) + 3x-4)/(-4x^(2)+3 x + m) can take all real values, x in R .

The function (x^(2)+2 x+c)/(x^(2)+4 x+3 c) assumes all real values only if

Find the interval in which 'm' lies so that the expression (mx^(2)+3x-4)/(-4x^(2)+3x+m) can take all real values,x in R.

Number of integral values of 'a for which the expression (x^(2)-ax+11)/(x^(2)-5x+4) can assume all real values is