Factorise: y^2-21 y+90 - Vidyadip

Question

Factorise:
$y^2-21 y+90$

✓

Answer

$y^2-21 y+90$
$=y^2-15 y-6 y+90$
$\{90=(-15) \times(-6),-21=-15-6\}$
$=y(y-15)-6(y-15)$
$=(y-15)(y-6)$

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