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X 2 − 2 X + 3 2 = 0 - Mathematics

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Question

\[x^2 - 2x + \frac{3}{2} = 0\]

Solution

\[x^2 - 2x + \frac{3}{2} = 0\]

\[ \Rightarrow x^2 - 2x + 1 + \frac{1}{2} = 0\]

\[ \Rightarrow \left( x - 1 \right)^2 - \left( \frac{1}{\sqrt{2}}i \right)^2 = 0\]

\[ \Rightarrow \left( x - 1 + \frac{1}{\sqrt{2}}i \right) \left( x - 1 - \frac{1}{\sqrt{2}}i \right) = 0\]

\[\Rightarrow \left( x - 1 - \frac{1}{\sqrt{2}}i \right) = 0\]  or,\[\left( x - 1 + \frac{1}{\sqrt{2}}i \right) = 0\]

\[\Rightarrow x = 1 + \frac{1}{\sqrt{2}}i\] or, \[x = 1 - \frac{1}{\sqrt{2}}i\]

Hence, the roots of the equation are  \[1 \pm \frac{1}{\sqrt{2}}i\] .

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Chapter 14: Quadratic Equations - Exercise 14.1 [Page 6]

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RD Sharma Mathematics [English] Class 11
Chapter 14 Quadratic Equations
Exercise 14.1 | Q 26 | Page 6

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