Factorise of the following : $27-125 a^{3}-135 a+225 a^{2}$
Factorise of the following : $27-125 a^{3}-135 a+225 a^{2}$
$27-125 a^{3}-135 a+225 a^{2}=(3)^{3}-(5 a)^{3}-3(3)(5 a)[3-5 a]$
$=(3-5 a)^{3}$ [Using Identity $VII$]
$=(3-5 a)(3-5 a)(3-5 a)$
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