Question

Factorise 216a^3 - 125b^3​

Answer 1

a³-b³= (a-b)( a²+b²+ab)

(6a)³-(5b)³= (6a-5b)( (6a²)+(5b)²+6a*5b)

(6a)³-(5b)³= (6a-5b)(36a²+25b²+30ab)

Answer 2

216a^3 - 125b^3

(6a)^3 - (5b)^3

(6a-5b)(36a^2+30ab+25b^2)

as a/c to the formula,

(a^3-b^3)=(a-b)(a^2+ab+b^2)

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