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    				| 1. | The values of m for which both roots of the equation x2 – mx + 1 = 0 are less than unity is(a) (-∞, -2)(b) (-∞, -2)(c) (-2, -∞)(d) none of these | 
| Answer» Correct option (b) (–∞,–2] Explanation: D ≥ 0 (–m)2 – 4.1.1 ≥ 0 (m – 2) (m + 2) ≥ 0 ⇒ m ∈ (–∞,–2] ∪ [2,∞) .... (1) a. f(1) > 0 1.(1 – m + 1) > 0 m < 2 m ∈(–∞,–2] ...(2) α + β < 2 m < 2 m ∈(–∞,–2] ...(3) Form (1), (2) and (3) we have m ∈(–∞,–2] | |