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Solve – x^2 + x – 2 = 0.(a) \(\frac{-1±i\sqrt{7}}{2}\)(b) \(\frac{1±i\sqrt{7}}{2}\)(c) \(\frac{1±\sqrt{7}}{2}\)(d) \(\frac{-1±\sqrt{7}}{2}\)The question was posed to me in homework.I need to ask this question from Quadratic Equations topic in chapter Complex Numbers and Quadratic Equations of Mathematics – Class 11

Answer» CORRECT option is (b) \(\frac{1±i\sqrt{7}}{2}\)

Explanation: – x^2 + x – 2 = 0

=>x^2-x+2 = 0

D=(-1)^2-4*1*2 = 1-8 = -7 ≤ 0.

Since D ≤ 0, imaginary ROOTS are there.

=>x = \(\frac{1±\sqrt{D}}{2.1} = \frac{1±i\sqrt{7}}{2}\).


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