Class 9th math 4.2 solution english PCTB

Question 4: Factorize:

\((vi)\) \(\; \) \(27-512y^3 \)

Solution:

$\displaystyle\ \ \ \ 27-512y^{3}$

$\displaystyle =( 3)^{3} -( 8y)^{3}$

$\displaystyle =( 3 -8y)\left[( 3)^{2} +( 3)( 8y) +( 8y)^{2}\right]$

$\displaystyle =( 3-8y)\left( 9+24y+64y^{2}\right)$

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