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Polynomial and Its General Form

Factorise 4...

Question

Factorise
$42 - x - x^{2}$

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Solution

$42 - x - x^{2}$
$\Rightarrow - [x^{2} + x - 42]$
$\Rightarrow - [x^{2} + 7 x - 6 x - 42]$
$\Rightarrow - (x + 7) (x - 6)$ .

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