exam Maths Puzzle Numerical Ability

8+3[24-2(14-2)]

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Use quadratic formula to solve 4x^2-8x+1=0.......

I answered (8+-4sqrt3)/8 on a quiz and got it wrong.

Thanks. Find the LCD of; 3/a, 3/b, 1/5, I thought that 5 was the LCD but it wasnt, could someone please explain why?