exam Maths Puzzle Numerical Ability

Please, how do i solve with the quadratic formula:

6x^2=x + 2

Thank you.

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exam Other Question

f(x)=x^3-5x^2-14x

f(x)=x^3+4x^2+9x+36

f(x)=x^4+x^3-2x^2+4x-24

please helpp! If you add 100 to the number you get a perfect square.
If you add 168 to that number you get another perfect square.
What is that number?