exam Maths Puzzle Numerical Ability

Hi! I really need help with this question. I have no idea how to answer it. Please help. It says to: Use the quadratic forumula to solve the following. Leave irrational roots in the simplest form.
3x^2-4x-5=0
Thank You=)

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exam Other Question
divide 5+ 3j over 2 + j I did the next step and came up with
10 - j5 + j6 -1 over 2^2 - (j^2)^2 I don't know if I did that right and not sure what to do next. What is the graph of the equation 6x2 - 24x - 5y2 - 10y - 11 = 0