Find the zeroes of the following quadratic polynomials and verify the relationship between the z...

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Find the zeroes of the following quadratic polynomials and verify the relationship between the zeroes and the coefficients.
(i) \( x^{2}-2 x-8 \)
(ii) \( 4 s^{2}-4 s+1 \)
(iii) \( 6 x^{2}-3-7 x \)
(iv) \( 4 u^{2}+8 u \)
(v) \( t^{2}-15 \)
(vi) \( 3 x^{2}-x-4 \)
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