exam Maths Puzzle Numerical Ability

Need help with this one: Solve by completing the square. Thank you :)

x^2-1/2x-3/16=0

answer choices:
a. -1/4, 3/4
b. -1/4, 2/3
c. -3/4, 1/4

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exam Other Question

How many 80 pound cement bags can I fit in a 40 foot shipping container? For f(x) = 1/x^2 -2x -8, find the interval(s) where f(x) < 0.

possible answers:
(-4,2)
(-2,4)
(2,4)
(2,8)

Pleeze show me. Thank you.