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Mathematics

Grade10

Easy

Question

Factorise x² – 2x – 8.

(x – 6) (x + 2)
(x + 6) (x – 2)
(x – 4) (x + 2)
(x + 4) (x – 2)

The correct answer is: (x – 4) (x + 2)

$text We need two numbers whose product is end text minus 8 text and whose sum is end text minus 2 text . end text$

The third line has the information that is required, so
$x squared minus 2 x minus 8 equals left parenthesis x minus 4 right parenthesis left parenthesis x plus 2 right parenthesis$

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