exam Maths Puzzle Numerical Ability

Solve by completing the square. Thank you for your help.
4t^2=8t-1
answer choices:
a. 2 +or- square root 7 over 2
b. 1 +or- square 3
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2
c. 1 +or- square root 3/2

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exam Other Question

Find the mean and the median.

-2, -7/4, 3/4, 4, 9
Are lines L1 through (-2,1) and (0,3) and L2 through points (3,2) and (5,0) perpendicular?