book Maths Puzzle Numerical Ability

solve for x: 3x^2-6x+2=0
If you use the Quadratic Formula I believe the answer comes out to be 1 plus or minus the square root of 3. is this correct?

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Respected sirs,kindly help me to solve this problem in one variable linear equation.

The present age of A and B is in the ratio of 7:5. After 5 years their age would be in the r
(x^3-8)/(x+2)