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Find the roots of the quadratic equatio...

Find the roots of the quadratic equations by applying the quadratic formula.
(i) `2x^2 -7x+3 =0`
(ii) `2x^2+x-4 =0`
(iii) `4x^2+4sqrt3x+3=0`
(iv) `2x^2+x+4 = 0`

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