Which is a sum of cubes? a3 + 18 a6 + 9 a9 + 16 a12 + 8
a3 + 18
a6 + 9
a9 + 16
a12 + 8

Step-by-step explanation:

let's check all the expressions

1.

here 18 is not a perfect cube.

2.

here 9 is not a perfect cube.

3.

here 16 is not a perfect cube.

4.

here 8 is a perfect cube, thus we can write above expression by using laws of exponents as

Thus, is a sum of cubes.

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step-by-step explanation: