itable ide 4. Expand (3a + 6b) 3 by using identity.
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Answer:
(3a-6b-2c)²
=(3a)²+(6b)²+(2c)²+2.3a.6b+2.6b.2c+2.3a.2c
=9a²+36b²+4c²+36ab+24bc+12ac Ans
(3a-4b)³
=(3a)³-(4b)³-3.3a.4b(3a-4b)
=27a³-64b³-36ab(3a-4b)
=27a³-64b³-108a²b+144ab² Ans
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