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What will be the polynomial if the value of α + β + γ = -√3 , αβ + βγ + γα = 4 and = \(\frac {-5}{3}\)?(a) x^3 + 3x^2 + 12x + 5(b) 3x^3 + √3 x^2 + 4x + 5(c) 3x^3 + 3√3 x^2 + 12x + 5(d) x^3 + √3 x^2 + 12x + 5I got this question in unit test.Origin of the question is Zeros and Coefficients of Polynomial topic in section Polynomials of Mathematics – Class 10 |
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Answer» CORRECT answer is (c) 3x^3 + 3√3 X^2 + 12X + 5 Explanation: α + β + γ = – √3, + βγ + γα = 4, αβγ = \(\frac {-5}{3}\) ∴ f(x) = x^3 – (α + β + γ) x^2 + (αβ + βγ + γα)x – αβγ Substituting we get, f(x) = x^3 + √3 x^2 + 4x + \(\frac {5}{3}\) f(x) = 3x^3 + 3√3 x^2 + 12x + 5 |
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