If $\alpha $ and $\beta $ are the roots of the equation 2x(2x + 1) = 1, then $\beta $ is equal to :

Question

If $\alpha $ and $\beta $ are the roots of the equation
2x(2x + 1) = 1, then $\beta $ is equal to :

$ - 2\alpha \left( {\alpha + 1} \right)$

$ 2\alpha \left( {\alpha + 1} \right)$

$2{\alpha ^2}$

$ 2\alpha \left( {\alpha - 1} \right)$

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