Question

(a-b)`3=a`3--। ::::::::::: + 3ab`2 - b^3

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Answer 1

Answer:

aloo le le bhindi lele ghiya kele lele

Answer 2

Answer:

To determine cube of a number means multiplying a number with itself three times similarly, cube of a binomial means multiplying a binomial with itself three times.

(a - b) (a - b) (a - b) = (a - b)3

or, (a - b) (a - b) (a - b) = (a - b) (a - b)2

= (a – b) (a2 + b2 - 2ab),

[Using the formula of (a + b) 2 = a2 - 2ab + b2]

= a (a2 + b2 – 2ab) – b (a2 + b2 – 2ab)

= a3 + ab2 – 2a2b – ba2 – b3 + 2ab2

= a3 – 3a2b + 3ab2 – b3