book Maths Puzzle Numerical Ability

please help me solve this equation 5x^2 + 33x -14 = 0 i know the answer is 0.4 but dont know how to show this or to work it out the proper way

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And aircraft carrier follows a course that has a latitude of 288 miles north and a departure of 240 miles east in two days. Find its bearing. For the function f(x)= -x^2-6x-8
(a) Find the line of symmetry
(b) State whether there is a minimum or a maximum and find that value
(c) Find the range