Which expression is a sum of cubes? a. -27a^3b^6+8a^9b^12 b. -9a^3b^6+a^9b^10 c. 9a^3b^6+8a^9b^12 d. 27a^3b^6+8a^9b^12

A.

D.

Step-by-step explanation:

A.

which is equivalent to

This expression is a sum of cubes.

B.

Here 9 is not a perfect cube and power of b in second term is 10 which is not a multiple of 3 , thus this cannot be written as sum of cubes.

C.

Here 9 is not a perfect cube. Thus this cannot be written as sum of cubes.

D.

This expression is a sum of cubes.

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step-by-step explanation: