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Q.18 (1) 4 (2)3 182 If the roots of the ...

Q.18 (1) 4 (2)3 182 If the roots of the equation bx2 + cx +a=0 be imaginary, then for all real values ofx, the expression 3b2x2 + Obcx + 2c2 is - [AIEEE 2009] (1) Greater than 4 ab (2) Less than 4ab (3) Greater than-4ab (4) Less than - 4ab

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