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If the sum as well as the product of roots of a quadratic equation is 9, then the equation is:(a) x2 + 9x – 18 = 0 (b) x2 – 18x + 9 = 0 (c) x2 + 9x + 9 = 0 (d) x2 – 9x + 9 = 0 |
Answer» (d) x2 – 9x + 9 = 0. Equation : x2 – (Sum of roots)x + Product of roots = 0 ⇒ x2 – 9x + 9 = 0. |
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