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Question

Expand: [32x+1]3

Solution
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[32x+1]3
(x+y)3=x3+y3+3x2y+3xy2
(32x)3+(1)3+3×(32x)2×1+3×(32x)×(1)2
278x3+1+3×94x2+3×32x×1
278x3+1+274x2+92x
278x3+274x2+92x+1 Ans

1146947_1102792_ans_6c87abaa277e4f11bd25157b9dc0359a.jpg

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