exam Maths Puzzle Numerical Ability

Solve each of the equations for x.
X^2- 4 = 17

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exam Other Question

I have been trying to help my daughter with this problem:
A 6 pointed regular star is formed by two interlocking equilateral triangles. What is the ratio of the area of the entir I am trying to complete the square for this equation
x^2=5x+2
Options on my test are
a.)5+sqrt20/2
b.)5+sqrt29/4
c.)5+sqrt33/4
d.)5+sqrt33/2
I am not even close to any of these options. please help