NDA Government Jobs Exams

If the sum of the roots of a quadratic equation is 3 and the product is 2, then the equation is

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NDA Other Question

Let N be the set of natural numbers and f : N → N be a function given by f(x) = x + 1 for x ∈ N. Which one
of the following is correct ?
(a) f is one-one and onto (b) f is one-one but not onto
(c) f is only onto (d) f is neither one-one nor onto If α and β are the roots of the equation x^2 + bx + c = 0, then what is the value of α^–1 + β^–1 ?