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Mathematics

Grade10

Easy

Question

Factorise x² + 3x - 10.

(x – 5) (x – 2)
(x + 5) (x + 2)
(x + 5) (x – 2)
(x – 5) (x + 2)

The correct answer is: (x + 5) (x – 2)

$text We need two numbers whose product is end text minus 10 text and whose sum is end text 3 text . end text$

The bottom line is the key line. Thus
$x squared plus 3 x minus 10 equals left parenthesis x plus 5 right parenthesis left parenthesis x minus 2 right parenthesis$

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