Question

Write the following cubes in expand form.

(a) ( a - 2b )³ (b) ( x - 2y/3 )³​

Answer 1

Answer: ill choose letter b;-;

(x - 2y/3)³ solve this problem

We know the algebraic identity,

(a-b)³ = a³- 3a²b + 3ab² - b³

Here ,

a = x , b = 2y/3 ,

Now ,

( x - 2y/3 )³

= x³-3*x²*(2y/3)+3*x*(2y/3)² - (2y/3)³

= x³ - (3x²*2y)/3 + ( 3x*4y²)/9 - 8y³/2

= x³ - 2x²y + 4xy²/3 - 8y³/27. answer

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