Factorise: x^2-23 x+42 - Vidyadip

Question

Factorise:
$x^2-23 x+42$

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Answer

$x^2-23 x+42$
$=x^2-2 x-21 x+42$
$\{42=(-2) \times(-21),-23=-2-21\}$
$=x(x-2)-21(x-2)$
$=(x-2)(x-21)$

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