book Maths Puzzle Numerical Ability

y=x-x^3 graphing you utlity to verify my solution

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Please help me rationalize the expression 2sqrt3+sqrt2/sqrt3-sqrt2 so there are no radicals in the denominator. I came up with 4-sqrt6
Thanks a lot This is a yes or no question. Determine if the line through P1 and P2 is parallel to the line through Q1 and Q2.

P1(2,1), P2(3,4); Q1(-2,1), Q2(2,2)