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    				| 1. | The polynomial equation (ax2+bx+c)(ax2–dx–c) = 0 , ac ≠ 0 has (a) four real roots(b) atleast two real roots(c) atmost two real roots(d) No real roots | 
| Answer» Correct option (b) atleast two real roots Explanation: ac ≠ 0 ac > 0 or ac < 0 Now D1 = b2 – 4ac & D2 = d2+ 4ac When ac > 0 D2 > 0 but D1 may positive or negative When ac < 0 D1 > 0 but D2 may be positive or negative In either case the polynomial has atleast two real roots | |