exam Maths Puzzle Numerical Ability

Please explain how to solve the quadratic equation:

3x^2 + 5x = -2

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exam Other Question

What is the set of all real numbers x such that 2x-4 a bicyclist and a hiker leave the same place at the same time and travel in the same direction.the bicyclist travels 3 times as fast as the hiker.at the end of 3 hours they are 24 miles apart.how fast does the hiker travel?