Factorise: x^2-9 x+20 - Vidyadip

Question

Factorise:
$x^2-9 x+20$

✓

Answer

$x^2-9 x+20$
$=x^2-5 x-4 x+20$
$\{20=(-5) \times(-4),-9=-5-4\}$
$=x(x-5)-4(x-5)$
$=(x-5)(x-4)$

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