Find the roots of the following quadratic equations, if they exist, by the method of completing ...

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Find the roots of the following quadratic equations, if they exist, by the method of completing the square:
(i) \( 2 x^{2}-7 x+3=0 \)
(ii) \( 2 x^{2}+x-4=0 \)
(iii) \( 4 x^{2}+4 \sqrt{3} x+3=0 \)
(iv) \( 2 x^{2}+x+4=0 \)
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