Question

find the cube of: 3a-2b

Answer 1

Hi ,

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We know the algebraic identity,

( x - y )³ = x³ - 3x²y + 3xy² - y³

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Now ,

x = 3a , y = 2b

( 3a - 2b )³

= (3a)³-3×(3a)²×2b+ 3×3a×(2b)²-(2b)³

= 27a³ - 54a²b + 36ab² - 8b³

I hope this helps you.

: )

Answer 2

Answer:

Step-by-step explanation:

Hi

My dear friends you know the identity (a+b)3=a3+b3+3ab(a+b)=a3+3a2b+3ab2+b3.

Just apply that.