exam Maths Puzzle Numerical Ability

Use the quadratic formula to solve the following equations

2x^2 + 12x = -5

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exam Other Question

Is this correct?
-9- radical 108, over 3(negative nine minus a square root of 108 over 3)
My answer is the square root of 3 times sqr root of 4, is this correct?
Solve for A: 1/A + 1/B + 1/C = D

I tried getting A by itself by using common denominators...but no luck
(not sure what category this fits in...sorry about that)
Thanks in advance