If the roots of are imaginary

MATHEMATICS · Single correct · CBSE · Mathematics · Quadratic Equations · Quadratic Equations

Problem

If the roots of bx2+cx+a=0bx^2+cx+a=0 are imaginary, then for all real values of xx, the expression 3b2x2+6bcx+2c23b^2x^2+6bcx+2c^2 is (1) less than −4ab-4ab (2) greater than 4ab4ab (3) less than 4ab4ab (4) greater than −4ab-4ab

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