book Maths Puzzle Numerical Ability

Please help me solve this of x:
x^2=-5x-3 -------the +- means there is a + sign with a - under it

A)x=5+-sqrt13/2
B)x=5+-sqrt13
C)x=-5+-sqrt13/2
D)x=-5+-sqrt13

Please show me how you worked this out...thanks

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book Other Question

Let f= 1 2 3 4 5
2 3 1 5 4

and

g= 1 2 3 4 5
3 4 2 5 1.

What is f inverse -1?
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