Question

factorise: a - 3b + a³ - 27b³​

Answer 1

Answer:

$(a -3b)(1+a^2+3ab+9b^2)$

Step-by-step explanation:

$a -3b+a^3-27b^3$

$= (a - 3b)+(a-3b)(a^2 + 3ab+9b^2)$

$= (a -3b)(1+a^2+3ab+9b^2)$

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