exam Maths Puzzle Numerical Ability

Solve.

3- a-1/a+2 = a^2-1/a+2

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exam Other Question

when ^ means square root

^3(^20+2^8) =

5^12+4^32-5^27 =

4^5/^72 = I do not think my question posted so I am going to try again. Here is the equation 3x^2-2x+1=0. I am confused by my answer: -2 +/- sqr rt -8,over 6. Is this the correct answer and if so do I leave it or break it down further?