Question

If a is equal to 3+ B then find the value of a cube minus B cube minus 9AB

Answer 1

Answer:

the answer is 27-9b

please do like my answer

and follow me

Answer 2

Answer:

A=3+B

A³-B³-9AB

(3+B)³-B³-9(3+B)B

27+B³+3(3+B)²B+3(3+B)B²-9(3+B)B-B³

27+3(3+B)²B+3(3+B)B²-9(3+B)B

27+3(3+B)B[(3+B)+B-3]

27+3(3+B)B(2B)

3³+9B+3B²(2B)

3³+18B²+6B³