Find the roots of the following quadra...

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

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