Four mark exericse problems II — task. Mathematics State Board, Class 8.

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Factorise the following expressions using

$(a - b)^3 = a^3 - 3a^2b + 3ab^2 - b^3$ identity.

1.

$y^3 - 18y^2 + 108y - 216 =$

$(3x - 4)^3$
$(3x + 4)^3$
$(4x + 3)^3$
$(4x - 3)^3$

2.

$8m^3 - 60m^2n + 150mn^2 - 125n^3 =$

$(3p + 2q)^3$
$(2p + 3q)^3$
$(2p - 3q)^3$
$(3p - 2q)^3$

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