Question

$(9a^ 2 +6ab+4b^ 2 ).(3a-2b)$
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Answer 1

(9a²+6ab+4b²) *(3a-2b)

= 9a²*(3a-2b) +6ab*(3a-2b) +4b²*(3a-2b)

=27a³ -18a²b+18a²b -12ab²+12b²a-8b³

=27a³ -8b³

=(3a)³-(2b)³