Question

Expand (1-7b³) using identity.​

Answer 1

Step-by-step explanation:

$(1 - 7 {b}^{3} ) \\by \: using \: identity = (a - b)^{3} = {a}^{3} - {b}^{3} - 3ab \: (a - b) \\ (1)^{3} - (7 {b})^{3} - 3(1)(7b) \: (1 - 7b) \\ 1 - 343b^{3} - 21b \: (1 - 7b) \\ 1 - 343b^{3} - 27b - 147 {b}^{2} \\ \\ \\ hope \: it \: will \: help \: you$

Answer 2

Answer:

Hey mate

Step-by-step explanation:

Hope it will help you