exam Maths Puzzle Numerical Ability

4x Plus 4
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12x squared plus 20x plus 8

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I cannot understand how to solve the quadratic equation: -1+3x^2=2x

I need to use the quadratic formula. My teacher wants us to leave it under the radical symbol if it is not a perfect square. a train leaves a station and travels east at 72km/h. three hours later a second train leaves on a parallel track and travels at 120km/h. When will the second train overtake the first train?