exam Maths Puzzle Numerical Ability

Hello, I am in deep need of help. I am suppose to use the sqrt property to solve equation.
(a-2)^2=8
Thanks for anyone that can help.

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exam Other Question
Solve for angle &#952; to the nearest degree, 0 degrees <(or equal to)&#952; < (or equal to) 90 degrees

a) sin &#952; = 1/2
b) tan &#952; = square root 3
b) cos &#952; = 0.253
DECIDE WHICH OF THE TWO POINTS IS A SOLUTION OF THE EQUATION.

X+Y=8
A.(2,4)
B.(2,6)