Solve each of these equations by completing the square. Leave your answers in surd form.

a) x + 6x + 1 = 0

b) x² – 4x – 8=0  

c) 4 – 2x – x² = 0

d) x² – 20x + 30 = 0

e) 3 + 8x – x² = 0 

f) x² + 14x – 1=0  

g) x² – 3x – 2 = 0  

h) x² – x – 3 = 0