exam Maths Puzzle Numerical Ability

Please help me solve this problem. simplify: 5radical7/radical 3

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exam Other Question

the problem is x^2-X-2= i CAME UP WITH (X+2)(X-1) Why wouldnt this be the right answer.
Next problem is 2x^2-x-3= I came up with (2x+3)(x-1) evaluate a - (12)for A=26