For a quadratic equation a and b are the roots for the equations, If a + b = 2 and a2 + b2 = 20, then find the respective quadratic equation.

1
x2 - 4x - 8 = 0
2
x2 - 7x - 8 = 0
3
x2 - 2x - 8 = 0
4
x2 + 2x - 8 = 0

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