exam Maths Puzzle Numerical Ability

Find the roots of 2x to the second power-5x+1=0

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In a bottling company, a machine can fill a 2-liter (L) bottle in 0.5 second (s) and move the next bottle into place in 0.1 s. How many 2-L bottles can be filled by the machine in 2 h? Can someone help me* my problem is to find a polynomial function of degree 3 with the given numbers as zeros. 2, i, -i