22.
Factorise the following expression:
a x2 y + b x y2 + c x y z
∵ ax2y = a × x × x × y = (x × y)[a × x]
bxy2 = b × x × y × y = (x × y)[b × y]
cxyz = c × x × y × z = (x × y) [c × z]
∴ a x2 y + b x y2 + c x y z = (x × y) [a × x + b × y + c × z]
= xy[ax + by +cz)
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