exam Maths Puzzle Numerical Ability

sqrt (y) + sqrt (y+7) = 7 please help me solve for the unknown and show all work

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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? Let p(x)=3x^3-2x^2+3x-2. Find the rational roots of the p(x).

I understand how to do synthetic division to find the rational roots, however, I am unclear on how to find the po