exam Maths Puzzle Numerical Ability

what is (8-the square root of 6)sqaured

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In studying the emission of light, in order to determine the angle at which the intensity is a giving value, the equation sin^2(A) - 4sin(A) + 1 = 0 must be solved. Find the angle A (to 0.1 of a degree). (sin^2(A) = (sinA)^2. -4-(3+6m)=1/2(4+2m)

Not in a text book. Not sure what to do when you subtract for the distributive property Im used 2 multiplication equations. Can you show all steps to help me?