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[" If the roots of the equation "bx^(2)+cx+a=0" be imaginary,then for all real values of "x" ,the expression "],[3b^(2)x^(2)+6bcx+2c^(2)" is :- "],[[" (1) Greater than "-" 4ab "," (2) Less than "" Aab "," (3) Greater than 4ab "," (4) Less than "4" ab "]]

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