Question
Factorise the following. $x^2- 10x + 21$
✓
Answer
$x^2- 10x + 21$
$ =x^2-(7+3) x+21 $
$ =x^2-7 x-3 x+21 $
$ =x(x-7)-3(x-7) $
$ =(x-7)(x-3) $
$ =x^2-(7+3) x+21 $
$ =x^2-7 x-3 x+21 $
$ =x(x-7)-3(x-7) $
$ =(x-7)(x-3) $
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