Q15.Expand each of the following, using suitable identities:
(ii) (2x + 1)3
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Answer:
8x³+12x²+6x+1
Step-by-step explanation:
(a+b)³ = a³+b³+3ab(a+b)
= (2x+1)³ = 8x³+1+3(2x×1)(2x+1)
8x³+1+6x(2x+1)
= 8x³+1+12x²+6x
8x³+12x²+6x+1
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