Question

e xpand (2b-1)wholepower3

Answer 1

here is your answer bro

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Q-1. {2b-1}^3

solution:-

we know that,

{x-y}^3 = x^3 - y^3 - 3yx^2 + 3xy^2

so,

{2b-1}^3 = {2b}^3 - {1^3} - 3×1×{2b}^2 + 3×2b×1^2

= 8b^3 - 1 - 3×4b^2 + 6b

= 8b^3 - 1 - 12 b^2 + 6b

= 8b^3 - 12b^2 + 6b - 1

☺

Answer 2

Hope, this may help you
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