Question

write the expansion of 3a -bpower3

Answer 1

Answer:

27a³-8ab-b

Step-by-step explanation:

1) (a-b)³ = a³+3a²b+3ab²+b³

a=3a and b=-b

=(3a)³+3(3a)²(-b)+3(3a)(-b²)+(-b)³

=27a³+3(9a)(-b)+3(3a)(b)+(-b)

=27a³-27ab+9ab-b

=27a³-8ab-b

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