chapter 3 expansion
Q2- expand the following
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Identity – (a+b)³ = a³+b³+3a²b+3ab²
(5a+4b)³
= (5a)³ + (4b)³ + 3(5a)²(4b) + 3(5a)(4b)²
= 125a³ + 64b³ + 300a²b + 240ab²
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