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[" 21.If the roots of the equation "bx^(...

[" 21.If the roots of the equation "bx^(2)+cx+a=0" be imaginary,"],[" then for all real values of "x," the expression "],[qquad [3b^(2)x^(2)+6bcx+2c^(2)" is: "," [2009] "],[" (a) less than "4ab," (b) greater than "-4ab],[" (c) "1" ess than "-4ab," (d) greater than "4ab]]

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