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If the roots of the equation bx^2 + cx + a = 0 be imaginary,

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If the roots of the equation bx2 + cx + a = 0 be imaginary, then for all real values of x. The expression 3b2x2 + 6bcx + 2c2 is

(a) less than 4ab 

(b) greater than – 4ab

(c) less than – 4ab 

(d) greater than 4ab

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Thus the minimum value is – 4ab.

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