The polynomial x3 + 64 is an example of a

A. sum of cubes

B. difference of cubes

C. difference of squares

D. perfect-square trinomial

X^3 is a perfect cube

64 is a perfect cube (since 64 = 4^3)

When I say "perfect cube" I mean it can be written in the form A^3 where "A" is a placeholder for a number or variable expression (such as x)

Since we have two cubes and we're adding them, we have a sum of cubes

Answer: Choice A) sum of cubes