book Maths Puzzle Numerical Ability

I would like to know if this cite is free,It asked for a registration number& pass word.I was not sure if I could be a member.

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I have a problem that says to simplify. I can get as far as the square root of 68. The correct answer is 2 sqaure roots of 17. Can you tell me the steps please to get to that point? Please, I need help with these problems. I confused on how to get started on it,
a)3y^2-4y-4

b)2x^2+12x-7=-2

c)[(x/3+4)]^2=27
marie