Expand:(I) (2a+b) ^3 plz help
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(2a + b)3 = (2a)3 + (b)3 + 3 × 2a × b(2a + b)
[(a + b)3 = a3 + b3 + 3ab (a + b)]
= 8a3 + b3 + 6ab (2a + b)
= 8a3 + b3 + 12a2b + 6ab2
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