Factorise :

$1 - 2 a - 3 a^{2}$

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Solution

$1 - 2 a - 3 a^{2} = 1 - 3 a + a - 3 a^{2} = (1 - 3 a) + a (1 - 3 a) = (1 - 3 a) (1 + a)$

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(a^{2} - 2 a + 3) (a^{2} - 2 a + 5) - 35

\sqrt{3} a^{2} + 2 a - 5 \sqrt{3}

1 - 2 a - 3 a^{2}

3 a^{2} - 1 - 2 a

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