book Maths Puzzle Numerical Ability

you deposit $712 into a saving account for three years. The account pays 6% annual interest,compounded monthly. To calculate the balance in your account after three years, you can

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This question is on elimination...
4x-2y=-14
3x-y=-8

My answer was (-2 7/10,-12 4/10) Is this right, because it looks way too big to be the answer
thanks I'm not sure how to handle the radical in this quadriatic equation:

x^2 + x + sqrt(x^2 + x) - 2 = 0

In the provide examples, the duplicated x^2 + x can be substituted by some